Add comprehensive tests for keyword detection, session state management, and user abort detection

- Implement tests for KeywordDetector including keyword detection, sanitization, and priority handling.
- Add tests for SessionStateService covering session validation, loading, saving, and state updates.
- Create tests for UserAbortDetector to validate user abort detection logic and pattern matching.

ccw/README.md

@@ -1,10 +1,17 @@
 # CCW - Claude Code Workflow CLI
-NEW LINE
 
 [![Version](https://img.shields.io/badge/version-v6.3.19-blue.svg)](https://github.com/catlog22/Claude-Code-Workflow/releases)
 
 A powerful command-line tool for managing Claude Code Workflow with native CodexLens code intelligence, multi-model CLI orchestration, and interactive dashboard.
 
+## What's New in v6.3
+
+### Hook System Integration
+- **Soft Enforcement Stop Hook**: Never blocks - injects continuation messages for active workflows/modes
+- **Mode System**: Keyword-based mode activation with exclusive mode conflict detection
+- **Checkpoint/Recovery**: Automatic state preservation before context compaction
+- **PreCompact Hook**: Creates checkpoints with mutex to prevent concurrent operations
+
 ## Installation
 
 ```bash
@@ -77,6 +84,44 @@ ccw view -o report.html
 - **Dimension Analysis**: Findings by review dimension (Security, Architecture, Quality, etc.)
 - **Tabbed Interface**: Switch between Workflow and Reviews tabs
 
+### Hook System
+- **Soft Enforcement Stop Hook**: Never blocks stops - injects continuation messages instead
+- **Mode System**: Keyword-based mode activation (`autopilot`, `ultrawork`, `swarm`, etc.)
+- **Checkpoint/Recovery**: Automatic state preservation before context compaction
+- **PreCompact Hook**: Creates checkpoints with mutex to prevent concurrent operations
+- **Exclusive Mode Detection**: Prevents conflicting modes from running concurrently
+
+## Quick Start with Hooks
+
+```bash
+# Configure hooks in .claude/settings.json
+{
+  "hooks": {
+    "PreCompact": [
+      {
+        "name": "Create Checkpoint",
+        "command": "ccw hook precompact --stdin",
+        "enabled": true
+      }
+    ],
+    "Stop": [
+      {
+        "name": "Soft Enforcement Stop",
+        "command": "ccw hook stop --stdin",
+        "enabled": true
+      }
+    ]
+  }
+}
+
+# Use mode keywords in prompts
+"use autopilot to implement the feature"
+"run ultrawork on this task"
+"cancelomc"  # Stops active modes
+```
+
+See [docs/hooks-integration.md](docs/hooks-integration.md) for full documentation.
+
 ## Dashboard Data Sources
 
 The CLI reads data from the `.workflow/` directory structure:

ccw/docs/hooks-integration.md

@@ -1,17 +1,20 @@
 # Hooks Integration for Progressive Disclosure
 
-This document describes how to integrate session hooks with CCW's progressive disclosure system.
+This document describes how to integrate session hooks with CCW's progressive disclosure system, including the new Soft Enforcement Stop Hook, Mode System, and Checkpoint/Recovery features.
 
 ## Overview
 
-CCW now supports automatic context injection via hooks. When a session starts, the system can automatically provide a progressive disclosure index showing related sessions from the same cluster.
+CCW supports automatic context injection via hooks. When a session starts, the system can automatically provide a progressive disclosure index showing related sessions from the same cluster.
 
-## Features
+### Key Features
 
 - **Automatic Context Injection**: Session start hooks inject cluster context
 - **Progressive Disclosure**: Shows related sessions, their summaries, and recovery commands
 - **Silent Failure**: Hook failures don't block session start (< 5 seconds timeout)
-- **Multiple Hook Types**: Supports `session-start`, `context`, and custom hooks
+- **Multiple Hook Types**: Supports `session-start`, `context`, `PreCompact`, `Stop`, and custom hooks
+- **Soft Enforcement**: Stop hooks never block - they inject continuation messages instead
+- **Mode System**: Keyword-based mode activation with exclusive mode conflict detection
+- **Checkpoint/Recovery**: Automatic state preservation before context compaction
 
 ## Hook Configuration
 
@@ -25,11 +28,15 @@ Place hook configurations in `.claude/settings.json`:
     "session-start": [
       {
         "name": "Progressive Disclosure",
-        "description": "Injects progressive disclosure index at session start",
+        "description": "Injects progressive disclosure index at session start with recovery detection",
         "enabled": true,
         "handler": "internal:context",
         "timeout": 5000,
-        "failMode": "silent"
+        "failMode": "silent",
+        "notes": [
+          "Checks for recovery checkpoints and injects recovery message if found",
+          "Uses RecoveryHandler.checkRecovery() for session recovery"
+        ]
       }
     ]
   }
@@ -39,13 +46,25 @@ Place hook configurations in `.claude/settings.json`:
 ### Hook Types
 
 #### `session-start`
-Triggered when a new session begins. Ideal for injecting context.
+Triggered when a new session begins. Ideal for injecting context and checking for recovery checkpoints.
 
-#### `context`
-Triggered on explicit context requests. Same handler as `session-start`.
+#### `PreCompact`
+Triggered before context compaction. Creates checkpoints to preserve session state including:
+- Active mode states
+- Workflow progress
+- TODO summaries
+
+#### `Stop`
+Triggered when a stop is requested. Uses **Soft Enforcement** - never blocks, but may inject continuation messages.
+
+#### `UserPromptSubmit`
+Triggered when a prompt is submitted. Detects mode keywords and activates corresponding execution modes.
 
 #### `session-end`
-Triggered when a session ends. Useful for updating cluster metadata.
+Triggered when a session ends. Useful for:
+- Updating cluster metadata
+- Cleaning up mode states
+- Final checkpoint creation
 
 #### `file-modified`
 Triggered when files are modified. Can be used for auto-commits or notifications.
@@ -73,6 +92,240 @@ In `command` fields, use these variables:
 - `$PROJECT_PATH`: Current project path
 - `$CLUSTER_ID`: Active cluster ID (if available)
 
+---
+
+## Soft Enforcement Stop Hook
+
+The Stop Hook implements **Soft Enforcement**: it never blocks stops, but injects continuation messages to encourage task completion.
+
+### Priority Order
+
+1. **context-limit**: Always allow (deadlock prevention)
+2. **user-abort**: Respect user intent
+3. **active-workflow**: Inject continuation message
+4. **active-mode**: Inject continuation message via ModeRegistryService
+
+### Configuration Example
+
+```json
+{
+  "hooks": {
+    "Stop": [
+      {
+        "name": "Soft Enforcement Stop",
+        "description": "Injects continuation messages for active workflows/modes",
+        "enabled": true,
+        "command": "ccw hook stop --stdin",
+        "timeout": 5000,
+        "failMode": "silent"
+      }
+    ]
+  }
+}
+```
+
+### Behavior Matrix
+
+| Condition | continue | mode | message |
+|-----------|----------|------|---------|
+| Context limit reached | `true` | `context-limit` | None |
+| User requested stop | `true` | `user-abort` | None |
+| Active workflow | `true` | `active-workflow` | Continuation message |
+| Active mode | `true` | `active-mode` | Mode-specific message |
+| Normal stop | `true` | `none` | None |
+
+### Context Limit Detection
+
+Detected via `ContextLimitDetector`:
+- `stop_reason: "context_limit_reached"`
+- `stop_reason: "end_turn_limit"`
+- `end_turn_reason: "max_tokens"`
+- `stop_reason: "max_context"`
+
+### User Abort Detection
+
+Detected via `UserAbortDetector`:
+- `user_requested: true`
+- `stop_reason: "user_cancel"`
+- `stop_reason: "cancel"`
+
+---
+
+## Mode System
+
+The Mode System provides centralized mode state management with file-based persistence.
+
+### Supported Modes
+
+| Mode | Type | Description |
+|------|------|-------------|
+| `autopilot` | Exclusive | Autonomous execution mode for multi-step tasks |
+| `ralph` | Non-exclusive | Research and Analysis Learning Pattern Handler |
+| `ultrawork` | Non-exclusive | Ultra-focused work mode for deep tasks |
+| `swarm` | Exclusive | Multi-agent swarm execution mode |
+| `pipeline` | Exclusive | Pipeline execution mode for sequential tasks |
+| `team` | Non-exclusive | Team collaboration mode |
+| `ultraqa` | Non-exclusive | Ultra-focused QA mode |
+
+### Exclusive Mode Conflict
+
+Exclusive modes (`autopilot`, `swarm`, `pipeline`) cannot run concurrently. Attempting to start one while another is active will be blocked.
+
+### Mode State Storage
+
+Mode states are stored in `.workflow/modes/`:
+```
+.workflow/modes/
+├── sessions/
+│   ├── {session-id}/
+│   │   ├── autopilot-state.json
+│   │   └── ralph-state.json
+│   └── ...
+└── (legacy shared states)
+```
+
+### Stale Marker Cleanup
+
+Mode markers older than 1 hour are automatically cleaned up to prevent crashed sessions from blocking indefinitely.
+
+### Mode Activation via Keyword
+
+Configure the `UserPromptSubmit` hook to detect keywords:
+
+```json
+{
+  "hooks": {
+    "UserPromptSubmit": [
+      {
+        "name": "Keyword Detection",
+        "description": "Detects mode keywords in prompts and activates corresponding modes",
+        "enabled": true,
+        "command": "ccw hook keyword --stdin",
+        "timeout": 5000,
+        "failMode": "silent"
+      }
+    ]
+  }
+}
+```
+
+### Supported Keywords
+
+| Keyword | Mode | Aliases |
+|---------|------|---------|
+| `autopilot` | autopilot | - |
+| `ultrawork` | ultrawork | `ulw` |
+| `ralph` | ralph | - |
+| `swarm` | swarm | - |
+| `pipeline` | pipeline | - |
+| `team` | team | - |
+| `ultraqa` | ultraqa | - |
+| `cancelomc` | Cancel | `stopomc` |
+| `codex` | Delegate | `gpt` |
+| `gemini` | Delegate | - |
+
+---
+
+## Checkpoint and Recovery
+
+The Checkpoint System preserves session state before context compaction.
+
+### Checkpoint Triggers
+
+| Trigger | Description |
+|---------|-------------|
+| `manual` | User-initiated checkpoint |
+| `auto` | Automatic checkpoint |
+| `compact` | Before context compaction |
+| `mode-switch` | When switching modes |
+| `session-end` | At session termination |
+
+### Checkpoint Storage
+
+Checkpoints are stored in `.workflow/checkpoints/`:
+
+```
+.workflow/checkpoints/
+├── 2025-02-18T10-30-45-sess123.json
+├── 2025-02-18T11-15-22-sess123.json
+└── ...
+```
+
+### Checkpoint Contents
+
+```json
+{
+  "id": "2025-02-18T10-30-45-sess123",
+  "created_at": "2025-02-18T10:30:45.000Z",
+  "trigger": "compact",
+  "session_id": "sess123",
+  "project_path": "/path/to/project",
+  "workflow_state": null,
+  "mode_states": {
+    "autopilot": {
+      "active": true,
+      "activatedAt": "2025-02-18T10:00:00.000Z"
+    }
+  },
+  "memory_context": null,
+  "todo_summary": {
+    "pending": 3,
+    "in_progress": 1,
+    "completed": 5
+  }
+}
+```
+
+### Recovery Flow
+
+```
+┌─────────────────┐
+│  Session Start  │
+└────────┬────────┘
+         │
+         v
+┌─────────────────┐     No checkpoint
+│  Check Recovery │ ──────────────────► Continue normally
+└────────┬────────┘
+         │ Checkpoint found
+         v
+┌─────────────────┐
+│ Load Checkpoint │
+└────────┬────────┘
+         │
+         v
+┌─────────────────┐
+│ Restore Modes   │
+└────────┬────────┘
+         │
+         v
+┌─────────────────┐
+│ Inject Message  │
+└─────────────────┘
+```
+
+### Automatic Cleanup
+
+Only the last 10 checkpoints per session are retained. Older checkpoints are automatically removed.
+
+---
+
+## PreCompact Hook with Mutex
+
+The PreCompact hook uses a mutex to prevent concurrent compaction operations for the same directory.
+
+### Mutex Behavior
+
+```
+Request 1 ──► PreCompact ──► Create checkpoint ──► Return
+                                                ▲
+Request 2 ──► Wait for Request 1 ────────────────┘
+```
+
+This prevents race conditions when multiple subagent results arrive simultaneously (e.g., in swarm/ultrawork modes).
+
+---
+
 ## API Endpoint
 
 ### Trigger Hook
@@ -105,15 +358,17 @@ Content-Type: application/json
 - `?path=/project/path`: Override project path
 - `?format=markdown|json`: Response format (default: markdown)
 
+---
+
 ## Progressive Disclosure Output Format
 
 The hook returns a structured Markdown document:
 
 ```markdown
 <ccw-session-context>
-## 📋 Related Sessions Index
+## Related Sessions Index
 
-### 🔗 Active Cluster: {cluster_name} ({member_count} sessions)
+### Active Cluster: {cluster_name} ({member_count} sessions)
 **Intent**: {cluster_intent}
 
 | # | Session | Type | Summary | Tokens |
@@ -130,11 +385,11 @@ ccw core-memory load {session_id}
 ccw core-memory load-cluster {cluster_id}
 ```
 
-### 📊 Timeline
+### Timeline
 ```
-2024-12-15 ─●─ WFS-001 (Implement auth)
+2024-12-15 -- WFS-001 (Implement auth)
         │
-2024-12-16 ─●─ CLI-002 (Fix login bug) ← Current
+2024-12-16 -- CLI-002 (Fix login bug) <- Current
 ```
 
 ---
@@ -142,9 +397,9 @@ ccw core-memory load-cluster {cluster_id}
 </ccw-session-context>
 ```
 
-## Examples
+---
 
-### Example 1: Basic Session Start Hook
+## Complete Configuration Example
 
 ```json
 {
@@ -152,78 +407,88 @@ ccw core-memory load-cluster {cluster_id}
     "session-start": [
       {
         "name": "Progressive Disclosure",
+        "description": "Injects progressive disclosure index at session start with recovery detection",
         "enabled": true,
         "handler": "internal:context",
         "timeout": 5000,
         "failMode": "silent"
       }
-    ]
-  }
-}
-```
-
-### Example 2: Custom Command Hook
-
-```json
-{
-  "hooks": {
+    ],
     "session-end": [
       {
-        "name": "Update Cluster",
+        "name": "Update Cluster Metadata",
+        "description": "Updates cluster metadata after session ends",
         "enabled": true,
         "command": "ccw core-memory update-cluster --session $SESSION_ID",
         "timeout": 30000,
         "async": true,
         "failMode": "log"
+      },
+      {
+        "name": "Mode State Cleanup",
+        "description": "Deactivates all active modes for the session",
+        "enabled": true,
+        "command": "ccw hook session-end --stdin",
+        "timeout": 5000,
+        "failMode": "silent"
       }
-    ]
-  }
-}
-```
-
-### Example 3: File Modification Hook
-
-```json
-{
-  "hooks": {
+    ],
+    "PreCompact": [
+      {
+        "name": "Create Checkpoint",
+        "description": "Creates checkpoint before context compaction",
+        "enabled": true,
+        "command": "ccw hook precompact --stdin",
+        "timeout": 10000,
+        "failMode": "log"
+      }
+    ],
+    "Stop": [
+      {
+        "name": "Soft Enforcement Stop",
+        "description": "Injects continuation messages for active workflows/modes",
+        "enabled": true,
+        "command": "ccw hook stop --stdin",
+        "timeout": 5000,
+        "failMode": "silent"
+      }
+    ],
+    "UserPromptSubmit": [
+      {
+        "name": "Keyword Detection",
+        "description": "Detects mode keywords in prompts and activates corresponding modes",
+        "enabled": true,
+        "command": "ccw hook keyword --stdin",
+        "timeout": 5000,
+        "failMode": "silent"
+      }
+    ],
     "file-modified": [
       {
-        "name": "Auto Commit",
+        "name": "Auto Commit Checkpoint",
+        "description": "Creates git checkpoint on file modifications",
         "enabled": false,
-        "command": "git add $FILE_PATH && git commit -m '[Auto] Save: $FILE_PATH'",
+        "command": "git add . && git commit -m \"[Auto] Checkpoint: $FILE_PATH\"",
         "timeout": 10000,
         "async": true,
         "failMode": "log"
       }
     ]
+  },
+  "notes": {
+    "handler": "Use 'internal:context' for built-in context generation, or 'command' for external commands",
+    "failMode": "Options: 'silent' (ignore errors), 'log' (log errors), 'fail' (abort on error)",
+    "variables": "Available: $SESSION_ID, $FILE_PATH, $PROJECT_PATH, $CLUSTER_ID",
+    "async": "Async hooks run in background and don't block the main flow",
+    "Stop hook": "The Stop hook uses Soft Enforcement - it never blocks but may inject continuation messages",
+    "PreCompact hook": "Creates checkpoint before compaction; uses mutex to prevent concurrent operations",
+    "UserPromptSubmit hook": "Detects mode keywords and activates corresponding execution modes",
+    "session-end hook": "Cleans up mode states using ModeRegistryService.deactivateMode()"
   }
 }
 ```
 
-## Implementation Details
-
-### Handler: `internal:context`
-
-The built-in context handler:
-
-1. Determines the current session ID
-2. Queries `SessionClusteringService` for related clusters
-3. Retrieves cluster members and their metadata
-4. Generates a progressive disclosure index
-5. Returns formatted Markdown within `<ccw-session-context>` tags
-
-### Timeout Behavior
-
-- Hooks have a maximum execution time (default: 5 seconds)
-- If timeout is exceeded, the hook is terminated
-- Behavior depends on `failMode`:
-  - `silent`: Continues without notification
-  - `log`: Logs timeout error
-  - `fail`: Aborts session start (not recommended)
-
-### Error Handling
-
-All errors are caught and handled according to `failMode`. The system ensures that hook failures never block the main workflow.
+---
 
 ## Testing
 
@@ -239,6 +504,16 @@ curl -X POST http://localhost:3456/api/hook \
 ccw core-memory context --format markdown
 ```
 
+### Run Integration Tests
+
+```bash
+# Run all hook integration tests
+node --test tests/integration/hooks-integration.test.ts
+
+# Run with verbose output
+node --test tests/integration/hooks-integration.test.ts --test-name-pattern="INT-.*"
+```
+
 ### Expected Output
 
 If a cluster exists:
@@ -250,6 +525,8 @@ If no cluster exists:
 - Message indicating no cluster found
 - Commands to search or trigger clustering
 
+---
+
 ## Troubleshooting
 
 ### Hook Not Triggering
@@ -270,25 +547,93 @@ If no cluster exists:
 2. Verify session metadata exists
 3. Check that the session has been added to a cluster
 
+### Mode Not Activating
+
+1. Check for conflicting exclusive modes
+2. Verify keyword spelling (case-insensitive)
+3. Check that keyword is not inside code blocks
+
+### Checkpoint Not Created
+
+1. Verify `.workflow/checkpoints/` directory exists
+2. Check disk space
+3. Review logs for error messages
+
+### Recovery Not Working
+
+1. Verify checkpoint exists in `.workflow/checkpoints/`
+2. Check that session ID matches
+3. Ensure checkpoint file is valid JSON
+
+---
+
 ## Performance Considerations
 
 - Progressive disclosure index generation is fast (< 1 second typical)
 - Uses cached metadata to avoid full session parsing
 - Timeout enforced to prevent blocking
 - Failures return empty content instead of errors
+- Mutex prevents concurrent compaction operations
+- Stale marker cleanup runs automatically
 
-## Future Enhancements
+---
 
-- **Dynamic Clustering**: Real-time cluster updates during session
-- **Multi-Cluster Support**: Show sessions from multiple related clusters
-- **Relevance Scoring**: Sort sessions by relevance to current task
-- **Token Budget**: Calculate total token usage for context loading
-- **Hook Chains**: Execute multiple hooks in sequence
-- **Conditional Hooks**: Execute hooks based on project state
+## Architecture Diagram
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                    Claude Code Session                       │
+└─────────────────────────────────────────────────────────────┘
+                              │
+                              │ Hook Events
+                              v
+┌─────────────────────────────────────────────────────────────┐
+│                      Hook System                             │
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐      │
+│  │Session Start │  │ PreCompact   │  │    Stop      │      │
+│  └──────┬───────┘  └──────┬───────┘  └──────┬───────┘      │
+│         │                 │                  │               │
+└─────────┼─────────────────┼──────────────────┼──────────────┘
+          │                 │                  │
+          v                 v                  v
+┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐
+│RecoveryHandler  │ │CheckpointService│ │  StopHandler    │
+│                 │ │                 │ │                 │
+│ - checkRecovery │ │ - create        │ │ - SoftEnforce   │
+│ - formatMessage │ │ - save          │ │ - detectMode    │
+└────────┬────────┘ └────────┬────────┘ └────────┬────────┘
+         │                   │                   │
+         v                   v                   v
+┌─────────────────────────────────────────────────────────────┐
+│                   ModeRegistryService                        │
+│                                                              │
+│  - activateMode / deactivateMode                            │
+│  - getActiveModes / canStartMode                            │
+│  - cleanupStaleMarkers                                      │
+│                                                              │
+│  Storage: .workflow/modes/sessions/{sessionId}/             │
+└─────────────────────────────────────────────────────────────┘
+                              │
+                              v
+┌─────────────────────────────────────────────────────────────┐
+│                  Checkpoint Storage                          │
+│                                                              │
+│  .workflow/checkpoints/{checkpoint-id}.json                 │
+│  - session_id, trigger, mode_states, workflow_state         │
+│  - Automatic cleanup (keep last 10 per session)             │
+└─────────────────────────────────────────────────────────────┘
+```
+
+---
 
 ## References
 
 - **Session Clustering**: See `session-clustering-service.ts`
 - **Core Memory Store**: See `core-memory-store.ts`
 - **Hook Routes**: See `routes/hooks-routes.ts`
-- **Example Configuration**: See `hooks-config-example.json`
+- **Stop Handler**: See `core/hooks/stop-handler.ts`
+- **Mode Registry**: See `core/services/mode-registry-service.ts`
+- **Checkpoint Service**: See `core/services/checkpoint-service.ts`
+- **Recovery Handler**: See `core/hooks/recovery-handler.ts`
+- **Keyword Detector**: See `core/hooks/keyword-detector.ts`
+- **Example Configuration**: See `templates/hooks-config-example.json`

ccw/src/commands/hook.ts

@@ -4,15 +4,13 @@
  */
 
 import chalk from 'chalk';
-import { existsSync, readFileSync, writeFileSync, mkdirSync } from 'fs';
-import { join, dirname } from 'path';
-import { homedir } from 'os';
+import { existsSync, readFileSync } from 'fs';
 
 interface HookOptions {
   stdin?: boolean;
   sessionId?: string;
   prompt?: string;
-  type?: 'session-start' | 'context' | 'session-end';
+  type?: 'session-start' | 'context' | 'session-end' | 'stop' | 'pre-compact';
   path?: string;
 }
 
@@ -21,12 +19,18 @@ interface HookData {
   prompt?: string;
   cwd?: string;
   tool_input?: Record<string, unknown>;
-}
-
-interface SessionState {
-  firstLoad: string;
-  loadCount: number;
-  lastPrompt?: string;
+  user_prompt?: string; // For UserPromptSubmit hook
+  // Stop context fields
+  stop_reason?: string;
+  stopReason?: string;
+  end_turn_reason?: string;
+  endTurnReason?: string;
+  user_requested?: boolean;
+  userRequested?: boolean;
+  active_mode?: 'analysis' | 'write' | 'review' | 'auto';
+  activeMode?: 'analysis' | 'write' | 'review' | 'auto';
+  active_workflow?: boolean;
+  activeWorkflow?: boolean;
 }
 
 /**
@@ -52,42 +56,6 @@ async function readStdin(): Promise<string> {
   });
 }
 
-/**
- * Get session state file path
- * Uses ~/.claude/.ccw-sessions/ for reliable persistence across sessions
- */
-function getSessionStateFile(sessionId: string): string {
-  const stateDir = join(homedir(), '.claude', '.ccw-sessions');
-  if (!existsSync(stateDir)) {
-    mkdirSync(stateDir, { recursive: true });
-  }
-  return join(stateDir, `session-${sessionId}.json`);
-}
-
-/**
- * Load session state from file
- */
-function loadSessionState(sessionId: string): SessionState | null {
-  const stateFile = getSessionStateFile(sessionId);
-  if (!existsSync(stateFile)) {
-    return null;
-  }
-  try {
-    const content = readFileSync(stateFile, 'utf-8');
-    return JSON.parse(content) as SessionState;
-  } catch {
-    return null;
-  }
-}
-
-/**
- * Save session state to file
- */
-function saveSessionState(sessionId: string, state: SessionState): void {
-  const stateFile = getSessionStateFile(sessionId);
-  writeFileSync(stateFile, JSON.stringify(state, null, 2));
-}
-
 /**
  * Get project path from hook data or current working directory
  */
@@ -95,27 +63,10 @@ function getProjectPath(hookCwd?: string): string {
   return hookCwd || process.cwd();
 }
 
-/**
- * Check if UnifiedContextBuilder is available (embedder dependencies present).
- * Returns the builder instance or null if not available.
- */
-async function tryCreateContextBuilder(projectPath: string): Promise<any | null> {
-  try {
-    const { isUnifiedEmbedderAvailable } = await import('../core/unified-vector-index.js');
-    if (!isUnifiedEmbedderAvailable()) {
-      return null;
-    }
-    const { UnifiedContextBuilder } = await import('../core/unified-context-builder.js');
-    return new UnifiedContextBuilder(projectPath);
-  } catch {
-    return null;
-  }
-}
-
 /**
  * Session context action - provides progressive context loading
  *
- * Uses UnifiedContextBuilder when available (embedder present):
+ * Uses HookContextService for unified context generation:
  *   - session-start: MEMORY.md summary + clusters + hot entities + patterns
  *   - per-prompt: vector search across all memory categories
  *
@@ -153,71 +104,59 @@ async function sessionContextAction(options: HookOptions): Promise<void> {
   try {
     const projectPath = getProjectPath(hookCwd);
 
-    // Load existing session state
-    const existingState = loadSessionState(sessionId);
-    const isFirstPrompt = !existingState;
+    // Check for recovery on session-start
+    const isFirstPrompt = !prompt || prompt.trim() === '';
+    let recoveryMessage = '';
 
-    // Update session state
-    const newState: SessionState = isFirstPrompt
-      ? {
-          firstLoad: new Date().toISOString(),
-          loadCount: 1,
-          lastPrompt: prompt
+    if (isFirstPrompt && sessionId) {
+      try {
+        const { RecoveryHandler } = await import('../core/hooks/recovery-handler.js');
+        const recoveryHandler = new RecoveryHandler({
+          projectPath,
+          enableLogging: !stdin
+        });
+
+        const checkpoint = await recoveryHandler.checkRecovery(sessionId);
+        if (checkpoint) {
+          recoveryMessage = await recoveryHandler.formatRecoveryMessage(checkpoint);
+          if (!stdin) {
+            console.log(chalk.yellow('Recovery checkpoint found!'));
+          }
+        }
+      } catch (recoveryError) {
+        // Recovery check failure should not affect session start
+        if (!stdin) {
+          console.log(chalk.yellow(`Recovery check warning: ${(recoveryError as Error).message}`));
         }
-      : {
-          ...existingState,
-          loadCount: existingState.loadCount + 1,
-          lastPrompt: prompt
-        };
-
-    saveSessionState(sessionId, newState);
-
-    // Determine context type and generate content
-    let contextType: 'session-start' | 'context';
-    let content = '';
-
-    // Try UnifiedContextBuilder first; fall back to getProgressiveIndex
-    const contextBuilder = await tryCreateContextBuilder(projectPath);
-
-    if (contextBuilder) {
-      // Use UnifiedContextBuilder
-      if (isFirstPrompt) {
-        contextType = 'session-start';
-        content = await contextBuilder.buildSessionStartContext();
-      } else if (prompt && prompt.trim().length > 0) {
-        contextType = 'context';
-        content = await contextBuilder.buildPromptContext(prompt);
-      } else {
-        contextType = 'context';
-        content = '';
-      }
-    } else {
-      // Fallback: use legacy SessionClusteringService.getProgressiveIndex()
-      const { SessionClusteringService } = await import('../core/session-clustering-service.js');
-      const clusteringService = new SessionClusteringService(projectPath);
-
-      if (isFirstPrompt) {
-        contextType = 'session-start';
-        content = await clusteringService.getProgressiveIndex({
-          type: 'session-start',
-          sessionId
-        });
-      } else if (prompt && prompt.trim().length > 0) {
-        contextType = 'context';
-        content = await clusteringService.getProgressiveIndex({
-          type: 'context',
-          sessionId,
-          prompt
-        });
-      } else {
-        contextType = 'context';
-        content = '';
       }
     }
 
+    // Use HookContextService for unified context generation
+    const { HookContextService } = await import('../core/services/hook-context-service.js');
+    const contextService = new HookContextService({ projectPath });
+
+    // Build context using the service
+    const result = await contextService.buildPromptContext({
+      sessionId,
+      prompt,
+      projectId: projectPath
+    });
+
+    const content = result.content;
+    const contextType = result.type;
+    const loadCount = result.state.loadCount;
+    const isAdvanced = await contextService.isAdvancedContextAvailable();
+
     if (stdin) {
       // For hooks: output content directly to stdout
-      if (content) {
+      // Include recovery message if available
+      if (recoveryMessage) {
+        process.stdout.write(recoveryMessage);
+        if (content) {
+          process.stdout.write('\n\n');
+          process.stdout.write(content);
+        }
+      } else if (content) {
         process.stdout.write(content);
       }
       process.exit(0);
@@ -229,9 +168,17 @@ async function sessionContextAction(options: HookOptions): Promise<void> {
     console.log(chalk.cyan('Session ID:'), sessionId);
     console.log(chalk.cyan('Type:'), contextType);
     console.log(chalk.cyan('First Prompt:'), isFirstPrompt ? 'Yes' : 'No');
-    console.log(chalk.cyan('Load Count:'), newState.loadCount);
-    console.log(chalk.cyan('Builder:'), contextBuilder ? 'UnifiedContextBuilder' : 'Legacy (getProgressiveIndex)');
+    console.log(chalk.cyan('Load Count:'), loadCount);
+    console.log(chalk.cyan('Builder:'), isAdvanced ? 'UnifiedContextBuilder' : 'Legacy (getProgressiveIndex)');
+    if (recoveryMessage) {
+      console.log(chalk.cyan('Recovery:'), 'Checkpoint found');
+    }
     console.log(chalk.gray('─'.repeat(40)));
+    if (recoveryMessage) {
+      console.log(chalk.yellow('Recovery Message:'));
+      console.log(recoveryMessage);
+      console.log();
+    }
     if (content) {
       console.log(content);
     } else {
@@ -250,10 +197,10 @@ async function sessionContextAction(options: HookOptions): Promise<void> {
 /**
  * Session end action - triggers async background tasks for memory maintenance.
  *
- * Tasks executed:
- *   1. Incremental vector embedding (index new/updated content)
- *   2. Incremental clustering (cluster unclustered sessions)
- *   3. Heat score updates (recalculate entity heat scores)
+ * Uses SessionEndService for unified task management:
+ *   - Incremental vector embedding (index new/updated content)
+ *   - Incremental clustering (cluster unclustered sessions)
+ *   - Heat score updates (recalculate entity heat scores)
  *
  * All tasks run best-effort; failures are logged but do not affect exit code.
  */
@@ -283,33 +230,58 @@ async function sessionEndAction(options: HookOptions): Promise<void> {
 
   try {
     const projectPath = getProjectPath(hookCwd);
-    const contextBuilder = await tryCreateContextBuilder(projectPath);
 
-    if (!contextBuilder) {
-      // UnifiedContextBuilder not available - skip session-end tasks
+    // Clean up mode states for this session
+    try {
+      const { ModeRegistryService } = await import('../core/services/mode-registry-service.js');
+      const modeRegistry = new ModeRegistryService({
+        projectPath,
+        enableLogging: !stdin
+      });
+
+      // Get active modes for this session and deactivate them
+      const activeModes = modeRegistry.getActiveModes(sessionId);
+      for (const mode of activeModes) {
+        modeRegistry.deactivateMode(mode, sessionId);
+        if (!stdin) {
+          console.log(chalk.gray(`  Deactivated mode: ${mode}`));
+        }
+      }
+    } catch (modeError) {
+      // Mode cleanup failure should not affect session end
       if (!stdin) {
-        console.log(chalk.gray('(UnifiedContextBuilder not available, skipping session-end tasks)'));
+        console.log(chalk.yellow(`  Mode cleanup warning: ${(modeError as Error).message}`));
+      }
+    }
+
+    // Use SessionEndService for unified task management
+    const { createSessionEndService } = await import('../core/services/session-end-service.js');
+    const sessionEndService = await createSessionEndService(projectPath, sessionId, !stdin);
+
+    const registeredTasks = sessionEndService.getRegisteredTasks();
+
+    if (registeredTasks.length === 0) {
+      // No tasks available - skip session-end tasks
+      if (!stdin) {
+        console.log(chalk.gray('(No session-end tasks available)'));
       }
       process.exit(0);
     }
 
-    const tasks: Array<{ name: string; execute: () => Promise<void> }> = contextBuilder.buildSessionEndTasks(sessionId);
-
     if (!stdin) {
-      console.log(chalk.green(`Session End: executing ${tasks.length} background tasks...`));
+      console.log(chalk.green(`Session End: executing ${registeredTasks.length} background tasks...`));
     }
 
-    // Execute all tasks concurrently (best-effort)
-    const results = await Promise.allSettled(
-      tasks.map((task: { name: string; execute: () => Promise<void> }) => task.execute())
-    );
+    // Execute all tasks
+    const summary = await sessionEndService.executeEndTasks(sessionId);
 
     if (!stdin) {
-      for (let i = 0; i < tasks.length; i++) {
-        const status = results[i].status === 'fulfilled' ? 'OK' : 'FAIL';
-        const color = status === 'OK' ? chalk.green : chalk.yellow;
-        console.log(color(`  [${status}] ${tasks[i].name}`));
+      for (const result of summary.results) {
+        const status = result.success ? 'OK' : 'FAIL';
+        const color = result.success ? chalk.green : chalk.yellow;
+        console.log(color(`  [${status}] ${result.type} (${result.duration}ms)`));
       }
+      console.log(chalk.gray(`Total: ${summary.successful}/${summary.totalTasks} tasks completed in ${summary.totalDuration}ms`));
     }
 
     process.exit(0);
@@ -322,6 +294,105 @@ async function sessionEndAction(options: HookOptions): Promise<void> {
   }
 }
 
+/**
+ * Stop action - handles Stop hook events with Soft Enforcement
+ *
+ * Uses StopHandler for priority-based stop handling:
+ *   1. context-limit: Always allow stop (deadlock prevention)
+ *   2. user-abort: Respect user intent
+ *   3. active-workflow: Inject continuation message
+ *   4. active-mode: Inject continuation message
+ *
+ * Returns { continue: true, message?: string } - never blocks stops.
+ */
+async function stopAction(options: HookOptions): Promise<void> {
+  let { stdin, sessionId } = options;
+  let hookCwd: string | undefined;
+  let hookData: HookData = {};
+
+  // If --stdin flag is set, read from stdin (Claude Code hook format)
+  if (stdin) {
+    try {
+      const stdinData = await readStdin();
+      if (stdinData) {
+        hookData = JSON.parse(stdinData) as HookData;
+        sessionId = hookData.session_id || sessionId;
+        hookCwd = hookData.cwd;
+      }
+    } catch {
+      // Silently continue if stdin parsing fails
+    }
+  }
+
+  try {
+    const projectPath = getProjectPath(hookCwd);
+
+    // Import StopHandler dynamically to avoid circular dependencies
+    const { StopHandler } = await import('../core/hooks/stop-handler.js');
+    const stopHandler = new StopHandler({
+      enableLogging: !stdin,
+      projectPath // Pass projectPath for ModeRegistryService integration
+    });
+
+    // Build stop context from hook data
+    const stopContext = {
+      session_id: sessionId,
+      sessionId: sessionId,
+      project_path: projectPath,
+      projectPath: projectPath,
+      stop_reason: hookData.stop_reason,
+      stopReason: hookData.stopReason,
+      end_turn_reason: hookData.end_turn_reason,
+      endTurnReason: hookData.endTurnReason,
+      user_requested: hookData.user_requested,
+      userRequested: hookData.userRequested,
+      active_mode: hookData.active_mode,
+      activeMode: hookData.activeMode,
+      active_workflow: hookData.active_workflow,
+      activeWorkflow: hookData.activeWorkflow
+    };
+
+    // Handle the stop event
+    const result = await stopHandler.handleStop(stopContext);
+
+    if (stdin) {
+      // For hooks: output JSON result to stdout
+      const output: { continue: true; message?: string } = {
+        continue: true
+      };
+      if (result.message) {
+        output.message = result.message;
+      }
+      process.stdout.write(JSON.stringify(output));
+      process.exit(0);
+    }
+
+    // Interactive mode: show detailed output
+    console.log(chalk.green('Stop Handler'));
+    console.log(chalk.gray('─'.repeat(40)));
+    console.log(chalk.cyan('Mode:'), result.mode || 'none');
+    console.log(chalk.cyan('Continue:'), result.continue);
+    if (result.message) {
+      console.log(chalk.yellow('Message:'));
+      console.log(result.message);
+    }
+    if (result.metadata) {
+      console.log(chalk.gray('─'.repeat(40)));
+      console.log(chalk.cyan('Metadata:'));
+      console.log(JSON.stringify(result.metadata, null, 2));
+    }
+    process.exit(0);
+  } catch (error) {
+    if (stdin) {
+      // Silent failure for hooks - always allow stop
+      process.stdout.write(JSON.stringify({ continue: true }));
+      process.exit(0);
+    }
+    console.error(chalk.red(`Error: ${(error as Error).message}`));
+    process.exit(1);
+  }
+}
+
 /**
  * Parse CCW status.json and output formatted status
  */
@@ -375,6 +446,238 @@ async function parseStatusAction(options: HookOptions): Promise<void> {
   }
 }
 
+/**
+ * Keyword detection and mode activation action
+ *
+ * Detects magic keywords in user prompts and activates corresponding modes.
+ * Called from UserPromptSubmit hook.
+ */
+async function keywordAction(options: HookOptions): Promise<void> {
+  let { stdin, sessionId, prompt } = options;
+  let hookCwd: string | undefined;
+
+  if (stdin) {
+    try {
+      const stdinData = await readStdin();
+      if (stdinData) {
+        const hookData = JSON.parse(stdinData) as HookData;
+        sessionId = hookData.session_id || sessionId;
+        hookCwd = hookData.cwd;
+        // Support both 'prompt' and 'user_prompt' fields
+        prompt = hookData.prompt || hookData.user_prompt || prompt;
+      }
+    } catch {
+      // Silently continue if stdin parsing fails
+    }
+  }
+
+  if (!prompt) {
+    // No prompt to analyze - just exit silently
+    if (stdin) {
+      process.exit(0);
+    }
+    console.error(chalk.red('Error: --prompt is required'));
+    process.exit(1);
+  }
+
+  try {
+    const projectPath = getProjectPath(hookCwd);
+
+    // Import keyword detector
+    const { getPrimaryKeyword, getAllKeywords, KEYWORD_PATTERNS } = await import('../core/hooks/keyword-detector.js');
+
+    // Detect keywords in prompt
+    const primaryKeyword = getPrimaryKeyword(prompt);
+
+    if (!primaryKeyword) {
+      // No keywords detected - exit silently for hooks
+      if (stdin) {
+        process.exit(0);
+      }
+      console.log(chalk.gray('No mode keywords detected'));
+      process.exit(0);
+    }
+
+    // Map keyword type to execution mode
+    const keywordToModeMap: Record<string, string> = {
+      'autopilot': 'autopilot',
+      'ralph': 'ralph',
+      'ultrawork': 'ultrawork',
+      'swarm': 'swarm',
+      'pipeline': 'pipeline',
+      'team': 'team',
+      'ultrapilot': 'team', // ultrapilot maps to team
+      'ultraqa': 'ultraqa'
+    };
+
+    const executionMode = keywordToModeMap[primaryKeyword.type];
+
+    if (!executionMode) {
+      // Keyword not mapped to execution mode (e.g., 'cancel', 'codex', 'gemini')
+      if (stdin) {
+        process.exit(0);
+      }
+      console.log(chalk.gray(`Keyword "${primaryKeyword.keyword}" detected but no execution mode mapped`));
+      process.exit(0);
+    }
+
+    // Generate sessionId if not provided
+    const effectiveSessionId = sessionId || `mode-${Date.now()}`;
+
+    // Import ModeRegistryService and activate mode
+    const { ModeRegistryService } = await import('../core/services/mode-registry-service.js');
+    const modeRegistry = new ModeRegistryService({
+      projectPath,
+      enableLogging: !stdin
+    });
+
+    // Check if mode can be started
+    const canStart = modeRegistry.canStartMode(executionMode as any, effectiveSessionId);
+    if (!canStart.allowed) {
+      if (stdin) {
+        // For hooks: just output a warning message
+        const output = {
+          continue: true,
+          systemMessage: `[MODE ACTIVATION BLOCKED] ${canStart.message}`
+        };
+        process.stdout.write(JSON.stringify(output));
+        process.exit(0);
+      }
+      console.log(chalk.yellow(`Cannot activate mode: ${canStart.message}`));
+      process.exit(0);
+    }
+
+    // Activate the mode
+    const activated = modeRegistry.activateMode(
+      executionMode as any,
+      effectiveSessionId,
+      { prompt, keyword: primaryKeyword.keyword }
+    );
+
+    if (stdin) {
+      // For hooks: output activation result
+      const output = {
+        continue: true,
+        systemMessage: activated
+          ? `[MODE ACTIVATED] ${executionMode.toUpperCase()} mode activated for this session. Keyword detected: "${primaryKeyword.keyword}"`
+          : `[MODE ACTIVATION FAILED] Could not activate ${executionMode} mode`
+      };
+      process.stdout.write(JSON.stringify(output));
+      process.exit(0);
+    }
+
+    // Interactive mode: show detailed output
+    console.log(chalk.green('Keyword Detection'));
+    console.log(chalk.gray('-'.repeat(40)));
+    console.log(chalk.cyan('Detected Keyword:'), primaryKeyword.keyword);
+    console.log(chalk.cyan('Type:'), primaryKeyword.type);
+    console.log(chalk.cyan('Position:'), primaryKeyword.position);
+    console.log(chalk.cyan('Execution Mode:'), executionMode);
+    console.log(chalk.cyan('Session ID:'), effectiveSessionId);
+    console.log(chalk.cyan('Activated:'), activated ? 'Yes' : 'No');
+    process.exit(0);
+  } catch (error) {
+    if (stdin) {
+      // Silent failure for hooks
+      process.exit(0);
+    }
+    console.error(chalk.red(`Error: ${(error as Error).message}`));
+    process.exit(1);
+  }
+}
+
+/**
+ * PreCompact action - handles PreCompact hook events
+ *
+ * Creates a checkpoint before context compaction to preserve state.
+ * Uses RecoveryHandler with mutex to prevent concurrent compaction.
+ *
+ * Returns { continue: true, systemMessage?: string } - checkpoint summary.
+ */
+async function preCompactAction(options: HookOptions): Promise<void> {
+  let { stdin, sessionId } = options;
+  let hookCwd: string | undefined;
+  let trigger: 'manual' | 'auto' = 'auto';
+
+  if (stdin) {
+    try {
+      const stdinData = await readStdin();
+      if (stdinData) {
+        const hookData = JSON.parse(stdinData) as HookData & {
+          trigger?: 'manual' | 'auto';
+          transcript_path?: string;
+          permission_mode?: string;
+          hook_event_name?: string;
+        };
+        sessionId = hookData.session_id || sessionId;
+        hookCwd = hookData.cwd;
+        trigger = hookData.trigger || 'auto';
+      }
+    } catch {
+      // Silently continue if stdin parsing fails
+    }
+  }
+
+  if (!sessionId) {
+    if (!stdin) {
+      console.error(chalk.red('Error: --session-id is required'));
+    }
+    // For hooks, use a default session ID
+    sessionId = `compact-${Date.now()}`;
+  }
+
+  try {
+    const projectPath = getProjectPath(hookCwd);
+
+    // Import RecoveryHandler dynamically
+    const { RecoveryHandler } = await import('../core/hooks/recovery-handler.js');
+    const recoveryHandler = new RecoveryHandler({
+      projectPath,
+      enableLogging: !stdin
+    });
+
+    // Handle PreCompact with mutex protection
+    const result = await recoveryHandler.handlePreCompact({
+      session_id: sessionId,
+      cwd: projectPath,
+      hook_event_name: 'PreCompact',
+      trigger
+    });
+
+    if (stdin) {
+      // For hooks: output JSON result to stdout
+      const output: { continue: boolean; systemMessage?: string } = {
+        continue: result.continue
+      };
+      if (result.systemMessage) {
+        output.systemMessage = result.systemMessage;
+      }
+      process.stdout.write(JSON.stringify(output));
+      process.exit(0);
+    }
+
+    // Interactive mode: show detailed output
+    console.log(chalk.green('PreCompact Handler'));
+    console.log(chalk.gray('─'.repeat(40)));
+    console.log(chalk.cyan('Session ID:'), sessionId);
+    console.log(chalk.cyan('Trigger:'), trigger);
+    console.log(chalk.cyan('Continue:'), result.continue);
+    if (result.systemMessage) {
+      console.log(chalk.yellow('System Message:'));
+      console.log(result.systemMessage);
+    }
+    process.exit(0);
+  } catch (error) {
+    if (stdin) {
+      // Don't block compaction on error
+      process.stdout.write(JSON.stringify({ continue: true }));
+      process.exit(0);
+    }
+    console.error(chalk.red(`Error: ${(error as Error).message}`));
+    process.exit(1);
+  }
+}
+
 /**
  * Notify dashboard action - send notification to running ccw view server
  */
@@ -424,6 +727,9 @@ ${chalk.bold('SUBCOMMANDS')}
   parse-status      Parse CCW status.json and display current/next command
   session-context   Progressive session context loading (replaces curl/bash hook)
   session-end       Trigger background memory maintenance tasks
+  stop              Handle Stop hook events with Soft Enforcement
+  keyword           Detect mode keywords in prompts and activate modes
+  pre-compact       Handle PreCompact hook events (checkpoint creation)
   notify            Send notification to ccw view dashboard
 
 ${chalk.bold('OPTIONS')}
@@ -442,10 +748,32 @@ ${chalk.bold('EXAMPLES')}
   ${chalk.gray('# Interactive usage:')}
   ccw hook session-context --session-id abc123
 
+  ${chalk.gray('# Handle Stop hook events:')}
+  ccw hook stop --stdin
+
   ${chalk.gray('# Notify dashboard:')}
   ccw hook notify --stdin
 
+  ${chalk.gray('# Detect mode keywords:')}
+  ccw hook keyword --stdin --prompt "use autopilot to implement auth"
+
+  ${chalk.gray('# Handle PreCompact events:')}
+  ccw hook pre-compact --stdin
+
 ${chalk.bold('HOOK CONFIGURATION')}
+  ${chalk.gray('Add to .claude/settings.json for Stop hook:')}
+  {
+    "hooks": {
+      "Stop": [{
+        "matcher": "",
+        "hooks": [{
+          "type": "command",
+          "command": "ccw hook stop --stdin"
+        }]
+      }]
+    }
+  }
+
   ${chalk.gray('Add to .claude/settings.json for status tracking:')}
   {
     "hooks": {
@@ -479,6 +807,16 @@ export async function hookCommand(
     case 'session-end':
       await sessionEndAction(options);
       break;
+    case 'stop':
+      await stopAction(options);
+      break;
+    case 'keyword':
+      await keywordAction(options);
+      break;
+    case 'pre-compact':
+    case 'precompact':
+      await preCompactAction(options);
+      break;
     case 'notify':
       await notifyAction(options);
       break;

ccw/src/core/hooks/context-limit-detector.ts

@@ -0,0 +1,120 @@
+/**
+ * ContextLimitDetector - Detects context limit stops
+ *
+ * When context is exhausted, Claude Code needs to stop so it can compact.
+ * Blocking these stops causes a deadlock: can't compact because can't stop,
+ * can't continue because context is full.
+ *
+ * This detector identifies context-limit related stop reasons to allow
+ * graceful handling of context exhaustion.
+ *
+ * @see https://github.com/Yeachan-Heo/oh-my-claudecode/issues/213
+ */
+
+/**
+ * Context from Stop hook event
+ *
+ * NOTE: Field names support both camelCase and snake_case variants
+ * for compatibility with different Claude Code versions.
+ */
+export interface StopContext {
+  /** Reason for stop (from Claude Code) - snake_case variant */
+  stop_reason?: string;
+  /** Reason for stop (from Claude Code) - camelCase variant */
+  stopReason?: string;
+  /** End turn reason (from API) - snake_case variant */
+  end_turn_reason?: string;
+  /** End turn reason (from API) - camelCase variant */
+  endTurnReason?: string;
+  /** Whether user explicitly requested stop - snake_case variant */
+  user_requested?: boolean;
+  /** Whether user explicitly requested stop - camelCase variant */
+  userRequested?: boolean;
+}
+
+/**
+ * Patterns that indicate context limit has been reached
+ *
+ * These patterns are matched case-insensitively against stop_reason
+ * and end_turn_reason fields.
+ */
+export const CONTEXT_LIMIT_PATTERNS: readonly string[] = [
+  'context_limit',
+  'context_window',
+  'context_exceeded',
+  'context_full',
+  'max_context',
+  'token_limit',
+  'max_tokens',
+  'conversation_too_long',
+  'input_too_long'
+] as const;
+
+/**
+ * Check if a reason string matches any context limit pattern
+ *
+ * @param reason - The reason string to check
+ * @returns true if the reason matches a context limit pattern
+ */
+function matchesContextPattern(reason: string): boolean {
+  const normalizedReason = reason.toLowerCase();
+  return CONTEXT_LIMIT_PATTERNS.some(pattern => normalizedReason.includes(pattern));
+}
+
+/**
+ * Detect if stop was triggered by context-limit related reasons
+ *
+ * When context is exhausted, Claude Code needs to stop so it can compact.
+ * Blocking these stops causes a deadlock: can't compact because can't stop,
+ * can't continue because context is full.
+ *
+ * @param context - The stop context from the hook event
+ * @returns true if the stop was due to context limit
+ */
+export function isContextLimitStop(context?: StopContext): boolean {
+  if (!context) return false;
+
+  // Get reasons from both field naming conventions
+  const stopReason = context.stop_reason ?? context.stopReason ?? '';
+  const endTurnReason = context.end_turn_reason ?? context.endTurnReason ?? '';
+
+  // Check both stop_reason and end_turn_reason for context limit patterns
+  return matchesContextPattern(stopReason) || matchesContextPattern(endTurnReason);
+}
+
+/**
+ * Get the matching context limit pattern if any
+ *
+ * @param context - The stop context from the hook event
+ * @returns The matching pattern or null if no match
+ */
+export function getMatchingContextPattern(context?: StopContext): string | null {
+  if (!context) return null;
+
+  const stopReason = (context.stop_reason ?? context.stopReason ?? '').toLowerCase();
+  const endTurnReason = (context.end_turn_reason ?? context.endTurnReason ?? '').toLowerCase();
+
+  for (const pattern of CONTEXT_LIMIT_PATTERNS) {
+    if (stopReason.includes(pattern) || endTurnReason.includes(pattern)) {
+      return pattern;
+    }
+  }
+
+  return null;
+}
+
+/**
+ * Get all matching context limit patterns
+ *
+ * @param context - The stop context from the hook event
+ * @returns Array of matching patterns (may be empty)
+ */
+export function getAllMatchingContextPatterns(context?: StopContext): string[] {
+  if (!context) return [];
+
+  const stopReason = (context.stop_reason ?? context.stopReason ?? '').toLowerCase();
+  const endTurnReason = (context.end_turn_reason ?? context.endTurnReason ?? '').toLowerCase();
+  const combinedReasons = `${stopReason} ${endTurnReason}`;
+
+  return CONTEXT_LIMIT_PATTERNS.filter(pattern => combinedReasons.includes(pattern));
+}

ccw/src/core/hooks/index.ts

@@ -0,0 +1,60 @@
+/**
+ * Core Hooks Module
+ *
+ * Provides detector functions and utilities for Claude Code hooks integration.
+ */
+
+// Context Limit Detector
+export {
+  isContextLimitStop,
+  getMatchingContextPattern,
+  getAllMatchingContextPatterns,
+  CONTEXT_LIMIT_PATTERNS,
+  type StopContext
+} from './context-limit-detector.js';
+
+// User Abort Detector
+export {
+  isUserAbort,
+  getMatchingAbortPattern,
+  getAllMatchingAbortPatterns,
+  shouldAllowContinuation,
+  USER_ABORT_EXACT_PATTERNS,
+  USER_ABORT_SUBSTRING_PATTERNS,
+  USER_ABORT_PATTERNS
+} from './user-abort-detector.js';
+
+// Keyword Detector
+export {
+  detectKeywords,
+  hasKeyword,
+  getAllKeywords,
+  getPrimaryKeyword,
+  getKeywordType,
+  hasKeywordType,
+  sanitizeText,
+  removeCodeBlocks,
+  KEYWORD_PATTERNS,
+  KEYWORD_PRIORITY,
+  type KeywordType,
+  type DetectedKeyword
+} from './keyword-detector.js';
+
+// Stop Handler
+export {
+  StopHandler,
+  createStopHandler,
+  defaultStopHandler,
+  type ExtendedStopContext,
+  type StopResult,
+  type StopHandlerOptions
+} from './stop-handler.js';
+
+// Recovery Handler
+export {
+  RecoveryHandler,
+  createRecoveryHandler,
+  type PreCompactInput,
+  type HookOutput,
+  type RecoveryHandlerOptions
+} from './recovery-handler.js';

ccw/src/core/hooks/keyword-detector.ts

@@ -0,0 +1,261 @@
+/**
+ * KeywordDetector - Detects magic keywords in user prompts
+ *
+ * Detects magic keywords in user prompts and returns the appropriate
+ * mode message to inject into context.
+ *
+ * Ported from oh-my-opencode's keyword-detector hook with adaptations
+ * for CCW architecture.
+ */
+
+/**
+ * Supported keyword types for mode detection
+ */
+export type KeywordType =
+  | 'cancel'      // Priority 1: Cancel all operations
+  | 'ralph'       // Priority 2: Ralph mode
+  | 'autopilot'   // Priority 3: Auto-pilot mode
+  | 'ultrapilot'  // Priority 4: Ultra-pilot mode (parallel build)
+  | 'team'        // Priority 4.5: Team mode (coordinated agents)
+  | 'ultrawork'   // Priority 5: Ultra-work mode
+  | 'swarm'       // Priority 6: Swarm mode (multiple agents)
+  | 'pipeline'    // Priority 7: Pipeline mode (chained agents)
+  | 'ralplan'     // Priority 8: Ralplan mode
+  | 'plan'        // Priority 9: Planning mode
+  | 'tdd'         // Priority 10: Test-driven development mode
+  | 'ultrathink'  // Priority 11: Deep thinking mode
+  | 'deepsearch'  // Priority 12: Deep search mode
+  | 'analyze'     // Priority 13: Analysis mode
+  | 'codex'       // Priority 14: Delegate to Codex
+  | 'gemini';     // Priority 15: Delegate to Gemini
+
+/**
+ * Detected keyword with metadata
+ */
+export interface DetectedKeyword {
+  /** Type of the detected keyword */
+  type: KeywordType;
+  /** The actual matched keyword string */
+  keyword: string;
+  /** Position in the original text where the keyword was found */
+  position: number;
+}
+
+/**
+ * Keyword patterns for each mode
+ */
+export const KEYWORD_PATTERNS: Record<KeywordType, RegExp> = {
+  cancel: /\b(cancelomc|stopomc)\b/i,
+  ralph: /\b(ralph)\b/i,
+  autopilot: /\b(autopilot|auto[\s-]?pilot|fullsend|full\s+auto)\b/i,
+  ultrapilot: /\b(ultrapilot|ultra-pilot)\b|\bparallel\s+build\b|\bswarm\s+build\b/i,
+  ultrawork: /\b(ultrawork|ulw)\b/i,
+  swarm: /\bswarm\s+\d+\s+agents?\b|\bcoordinated\s+agents\b|\bteam\s+mode\b/i,
+  team: /(?<!\b(?:my|the|our|a|his|her|their|its)\s)\bteam\b|\bcoordinated\s+team\b/i,
+  pipeline: /\bagent\s+pipeline\b|\bchain\s+agents\b/i,
+  ralplan: /\b(ralplan)\b/i,
+  plan: /\bplan\s+(this|the)\b/i,
+  tdd: /\b(tdd)\b|\btest\s+first\b/i,
+  ultrathink: /\b(ultrathink)\b/i,
+  deepsearch: /\b(deepsearch)\b|\bsearch\s+the\s+codebase\b|\bfind\s+in\s+(the\s+)?codebase\b/i,
+  analyze: /\b(deep[\s-]?analyze|deepanalyze)\b/i,
+  codex: /\b(ask|use|delegate\s+to)\s+(codex|gpt)\b/i,
+  gemini: /\b(ask|use|delegate\s+to)\s+gemini\b/i
+};
+
+/**
+ * Priority order for keyword detection
+ * Higher priority keywords are checked first and take precedence in conflict resolution
+ */
+export const KEYWORD_PRIORITY: KeywordType[] = [
+  'cancel', 'ralph', 'autopilot', 'ultrapilot', 'team', 'ultrawork',
+  'swarm', 'pipeline', 'ralplan', 'plan', 'tdd',
+  'ultrathink', 'deepsearch', 'analyze', 'codex', 'gemini'
+];
+
+/**
+ * Remove code blocks from text to prevent false positives
+ * Handles both fenced code blocks and inline code
+ *
+ * @param text - The text to clean
+ * @returns Text with code blocks removed
+ */
+export function removeCodeBlocks(text: string): string {
+  // Remove fenced code blocks (``` or ~~~)
+  let result = text.replace(/```[\s\S]*?```/g, '');
+  result = result.replace(/~~~[\s\S]*?~~~/g, '');
+
+  // Remove inline code (single backticks)
+  result = result.replace(/`[^`]+`/g, '');
+
+  return result;
+}
+
+/**
+ * Sanitize text for keyword detection by removing structural noise.
+ * Strips XML tags, URLs, file paths, and code blocks.
+ *
+ * @param text - The text to sanitize
+ * @returns Sanitized text ready for keyword detection
+ */
+export function sanitizeText(text: string): string {
+  // Remove XML tag blocks (opening + content + closing; tag names must match)
+  let result = text.replace(/<(\w[\w-]*)[\s>][\s\S]*?<\/\1>/g, '');
+  // Remove self-closing XML tags
+  result = result.replace(/<\w[\w-]*(?:\s[^>]*)?\s*\/>/g, '');
+  // Remove URLs
+  result = result.replace(/https?:\/\/\S+/g, '');
+  // Remove file paths - requires leading / or ./ or multi-segment dir/file.ext
+  result = result.replace(/(^|[\s"'`(])(?:\.?\/(?:[\w.-]+\/)*[\w.-]+|(?:[\w.-]+\/)+[\w.-]+\.\w+)/gm, '$1');
+  // Remove code blocks (fenced and inline)
+  result = removeCodeBlocks(result);
+  return result;
+}
+
+/**
+ * Detect keywords in text and return matches with type info
+ *
+ * @param text - The text to analyze
+ * @param options - Optional configuration
+ * @returns Array of detected keywords with metadata
+ */
+export function detectKeywords(
+  text: string,
+  options?: { teamEnabled?: boolean }
+): DetectedKeyword[] {
+  const detected: DetectedKeyword[] = [];
+  const cleanedText = sanitizeText(text);
+  const teamEnabled = options?.teamEnabled ?? false;
+
+  // Check each keyword type in priority order
+  for (const type of KEYWORD_PRIORITY) {
+    // Skip team-related types when team feature is disabled
+    if ((type === 'team' || type === 'ultrapilot' || type === 'swarm') && !teamEnabled) {
+      continue;
+    }
+
+    const pattern = KEYWORD_PATTERNS[type];
+    const match = cleanedText.match(pattern);
+
+    if (match && match.index !== undefined) {
+      detected.push({
+        type,
+        keyword: match[0],
+        position: match.index
+      });
+
+      // Legacy ultrapilot/swarm also activate team mode internally
+      if (teamEnabled && (type === 'ultrapilot' || type === 'swarm')) {
+        detected.push({
+          type: 'team',
+          keyword: match[0],
+          position: match.index
+        });
+      }
+    }
+  }
+
+  return detected;
+}
+
+/**
+ * Check if text contains any magic keyword
+ *
+ * @param text - The text to check
+ * @returns true if any keyword is detected
+ */
+export function hasKeyword(text: string): boolean {
+  return detectKeywords(text).length > 0;
+}
+
+/**
+ * Get all detected keywords with conflict resolution applied
+ *
+ * Conflict resolution rules:
+ * - cancel suppresses everything (exclusive)
+ * - team beats autopilot (mutual exclusion)
+ *
+ * @param text - The text to analyze
+ * @param options - Optional configuration
+ * @returns Array of resolved keyword types in priority order
+ */
+export function getAllKeywords(
+  text: string,
+  options?: { teamEnabled?: boolean }
+): KeywordType[] {
+  const detected = detectKeywords(text, options);
+
+  if (detected.length === 0) return [];
+
+  let types = Array.from(new Set(detected.map(d => d.type)));
+
+  // Exclusive: cancel suppresses everything
+  if (types.includes('cancel')) return ['cancel'];
+
+  // Mutual exclusion: team beats autopilot (ultrapilot/swarm now map to team at detection)
+  if (types.includes('team') && types.includes('autopilot')) {
+    types = types.filter(t => t !== 'autopilot');
+  }
+
+  // Sort by priority order
+  return KEYWORD_PRIORITY.filter(k => types.includes(k));
+}
+
+/**
+ * Get the highest priority keyword detected with conflict resolution
+ *
+ * @param text - The text to analyze
+ * @param options - Optional configuration
+ * @returns The primary detected keyword or null if none found
+ */
+export function getPrimaryKeyword(
+  text: string,
+  options?: { teamEnabled?: boolean }
+): DetectedKeyword | null {
+  const allKeywords = getAllKeywords(text, options);
+
+  if (allKeywords.length === 0) {
+    return null;
+  }
+
+  // Get the highest priority keyword type
+  const primaryType = allKeywords[0];
+
+  // Find the original detected keyword for this type
+  const detected = detectKeywords(text, options);
+  const match = detected.find(d => d.type === primaryType);
+
+  return match || null;
+}
+
+/**
+ * Get keyword type for a given keyword string
+ *
+ * @param keyword - The keyword string to look up
+ * @returns The keyword type or null if not found
+ */
+export function getKeywordType(keyword: string): KeywordType | null {
+  const normalizedKeyword = keyword.toLowerCase();
+
+  for (const type of KEYWORD_PRIORITY) {
+    const pattern = KEYWORD_PATTERNS[type];
+    if (pattern.test(normalizedKeyword)) {
+      return type;
+    }
+  }
+
+  return null;
+}
+
+/**
+ * Check if a specific keyword type is detected in text
+ *
+ * @param text - The text to check
+ * @param type - The keyword type to look for
+ * @returns true if the keyword type is detected
+ */
+export function hasKeywordType(text: string, type: KeywordType): boolean {
+  const cleanedText = sanitizeText(text);
+  const pattern = KEYWORD_PATTERNS[type];
+  return pattern.test(cleanedText);
+}

ccw/src/core/hooks/recovery-handler.ts

@@ -0,0 +1,328 @@
+/**
+ * RecoveryHandler - Session Recovery and PreCompact Handler
+ *
+ * Handles PreCompact hook events and session recovery for state preservation
+ * during context compaction and session restarts.
+ *
+ * Features:
+ *   - PreCompact checkpoint creation before context compaction
+ *   - Session recovery detection and message injection
+ *   - Mutex lock to prevent concurrent compaction operations
+ *
+ * Based on oh-my-claudecode pre-compact pattern.
+ */
+
+import type { Checkpoint, CheckpointTrigger } from '../services/checkpoint-service.js';
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * Input from PreCompact hook event
+ */
+export interface PreCompactInput {
+  /** Session ID */
+  session_id: string;
+  /** Path to transcript file */
+  transcript_path?: string;
+  /** Current working directory */
+  cwd: string;
+  /** Permission mode */
+  permission_mode?: string;
+  /** Hook event name */
+  hook_event_name: 'PreCompact';
+  /** Trigger type */
+  trigger: 'manual' | 'auto';
+  /** Custom instructions */
+  custom_instructions?: string;
+}
+
+/**
+ * Output for hook handlers
+ */
+export interface HookOutput {
+  /** Whether to continue with the operation */
+  continue: boolean;
+  /** System message for context injection */
+  systemMessage?: string;
+}
+
+/**
+ * Options for RecoveryHandler
+ */
+export interface RecoveryHandlerOptions {
+  /** Project root path */
+  projectPath: string;
+  /** Enable logging */
+  enableLogging?: boolean;
+}
+
+// =============================================================================
+// Compaction Mutex
+// =============================================================================
+
+/**
+ * Per-directory in-flight compaction promises.
+ * When a compaction is already running for a directory, new callers
+ * await the existing promise instead of running concurrently.
+ * This prevents race conditions when multiple subagent results
+ * arrive simultaneously (swarm/ultrawork).
+ */
+const inflightCompactions = new Map<string, Promise<HookOutput>>();
+
+/**
+ * Queue depth counter per directory for diagnostics.
+ * Tracks how many callers are waiting on an in-flight compaction.
+ */
+const compactionQueueDepth = new Map<string, number>();
+
+// =============================================================================
+// RecoveryHandler Class
+// =============================================================================
+
+/**
+ * Handler for PreCompact hook events and session recovery
+ */
+export class RecoveryHandler {
+  private projectPath: string;
+  private enableLogging: boolean;
+
+  constructor(options: RecoveryHandlerOptions) {
+    this.projectPath = options.projectPath;
+    this.enableLogging = options.enableLogging ?? false;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: PreCompact Handler
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Handle PreCompact hook event
+   *
+   * Creates a checkpoint before compaction to preserve state.
+   * Uses mutex to prevent concurrent compaction for the same directory.
+   *
+   * @param input - PreCompact hook input
+   * @returns Promise resolving to hook output with checkpoint summary
+   */
+  async handlePreCompact(input: PreCompactInput): Promise<HookOutput> {
+    const directory = input.cwd || this.projectPath;
+
+    // Check for in-flight compaction
+    const inflight = inflightCompactions.get(directory);
+    if (inflight) {
+      const depth = (compactionQueueDepth.get(directory) ?? 0) + 1;
+      compactionQueueDepth.set(directory, depth);
+      try {
+        // Await the existing compaction result
+        return await inflight;
+      } finally {
+        const current = compactionQueueDepth.get(directory) ?? 1;
+        if (current <= 1) {
+          compactionQueueDepth.delete(directory);
+        } else {
+          compactionQueueDepth.set(directory, current - 1);
+        }
+      }
+    }
+
+    // No in-flight compaction - run it and register the promise
+    const compactionPromise = this.doHandlePreCompact(input);
+    inflightCompactions.set(directory, compactionPromise);
+
+    try {
+      return await compactionPromise;
+    } finally {
+      inflightCompactions.delete(directory);
+    }
+  }
+
+  /**
+   * Internal PreCompact handler (unserialized)
+   */
+  private async doHandlePreCompact(input: PreCompactInput): Promise<HookOutput> {
+    this.log(`Creating checkpoint for session ${input.session_id} (trigger: ${input.trigger})`);
+
+    try {
+      // Import services dynamically
+      const { CheckpointService } = await import('../services/checkpoint-service.js');
+      const { ModeRegistryService } = await import('../services/mode-registry-service.js');
+
+      // Create checkpoint service
+      const checkpointService = new CheckpointService({
+        projectPath: this.projectPath,
+        enableLogging: this.enableLogging
+      });
+
+      // Get mode registry for active modes
+      const modeRegistry = new ModeRegistryService({
+        projectPath: this.projectPath,
+        enableLogging: this.enableLogging
+      });
+
+      // Collect active mode states
+      const activeModes = modeRegistry.getActiveModes(input.session_id);
+      const modeStates: Record<string, { active: boolean; phase?: string; activatedAt?: string }> = {};
+
+      for (const mode of activeModes) {
+        modeStates[mode] = {
+          active: true,
+          activatedAt: new Date().toISOString()
+        };
+      }
+
+      // Create checkpoint
+      const trigger: CheckpointTrigger = input.trigger === 'manual' ? 'manual' : 'compact';
+      const checkpoint = await checkpointService.createCheckpoint(
+        input.session_id,
+        trigger,
+        {
+          modeStates: modeStates as any,
+          workflowState: null,
+          memoryContext: null
+        }
+      );
+
+      // Save checkpoint
+      await checkpointService.saveCheckpoint(checkpoint);
+
+      // Format recovery message
+      const systemMessage = checkpointService.formatRecoveryMessage(checkpoint);
+
+      this.log(`Checkpoint created: ${checkpoint.id}`);
+
+      return {
+        continue: true,
+        systemMessage
+      };
+    } catch (error) {
+      this.log(`Error creating checkpoint: ${(error as Error).message}`);
+
+      // Return success even on error - don't block compaction
+      return {
+        continue: true,
+        systemMessage: `[PRECOMPACT WARNING] Checkpoint creation failed: ${(error as Error).message}. Proceeding with compaction.`
+      };
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Recovery Detection
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check for recoverable checkpoint for a session
+   *
+   * @param sessionId - The session ID to check
+   * @returns The most recent checkpoint or null if none found
+   */
+  async checkRecovery(sessionId: string): Promise<Checkpoint | null> {
+    try {
+      const { CheckpointService } = await import('../services/checkpoint-service.js');
+
+      const checkpointService = new CheckpointService({
+        projectPath: this.projectPath,
+        enableLogging: this.enableLogging
+      });
+
+      const checkpoint = await checkpointService.getLatestCheckpoint(sessionId);
+
+      if (checkpoint) {
+        this.log(`Found recoverable checkpoint: ${checkpoint.id} (trigger: ${checkpoint.trigger})`);
+      }
+
+      return checkpoint;
+    } catch (error) {
+      this.log(`Error checking recovery: ${(error as Error).message}`);
+      return null;
+    }
+  }
+
+  /**
+   * Generate recovery message for context injection
+   *
+   * @param checkpoint - The checkpoint to format
+   * @returns Formatted recovery message
+   */
+  async formatRecoveryMessage(checkpoint: Checkpoint): Promise<string> {
+    try {
+      const { CheckpointService } = await import('../services/checkpoint-service.js');
+
+      const checkpointService = new CheckpointService({
+        projectPath: this.projectPath,
+        enableLogging: false
+      });
+
+      return checkpointService.formatRecoveryMessage(checkpoint);
+    } catch (error) {
+      // Fallback to basic format
+      return `# Session Recovery
+
+**Checkpoint ID:** ${checkpoint.id}
+**Created:** ${checkpoint.created_at}
+**Trigger:** ${checkpoint.trigger}
+**Session:** ${checkpoint.session_id}
+
+*This checkpoint was created to preserve session state.*`;
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Mutex Status
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check if compaction is currently in progress for a directory
+   *
+   * @param directory - The directory to check
+   * @returns true if compaction is in progress
+   */
+  isCompactionInProgress(directory: string): boolean {
+    return inflightCompactions.has(directory);
+  }
+
+  /**
+   * Get the number of callers queued behind an in-flight compaction
+   *
+   * @param directory - The directory to check
+   * @returns Number of queued callers (0 if no compaction in progress)
+   */
+  getCompactionQueueDepth(directory: string): number {
+    return compactionQueueDepth.get(directory) ?? 0;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Private: Utility Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Log a message if logging is enabled
+   */
+  private log(message: string): void {
+    if (this.enableLogging) {
+      const timestamp = new Date().toISOString();
+      console.log(`[RecoveryHandler ${timestamp}] ${message}`);
+    }
+  }
+}
+
+// =============================================================================
+// Factory Function
+// =============================================================================
+
+/**
+ * Create a RecoveryHandler instance
+ *
+ * @param options - Handler options
+ * @returns RecoveryHandler instance
+ */
+export function createRecoveryHandler(options: RecoveryHandlerOptions): RecoveryHandler {
+  return new RecoveryHandler(options);
+}
+
+// =============================================================================
+// Default Export
+// =============================================================================
+
+export default RecoveryHandler;

ccw/src/core/hooks/stop-handler.ts

@@ -0,0 +1,365 @@
+/**
+ * StopHandler - Unified stop hook handler with Soft Enforcement
+ *
+ * Handles Stop hook events with priority-based checking:
+ *   1. context-limit: Always allow stop (deadlock prevention)
+ *   2. user-abort: Respect user intent
+ *   3. active-workflow: Inject continuation message
+ *   4. active-mode: Inject continuation message (uses ModeRegistryService)
+ *
+ * Design:
+ *   - ALWAYS returns continue: true (Soft Enforcement)
+ *   - Injects continuation message instead of blocking
+ *   - Logs all stop events for debugging
+ *   - Integrates with ModeRegistryService for mode state detection
+ */
+
+import { isContextLimitStop } from './context-limit-detector.js';
+import { isUserAbort, type StopContext } from './user-abort-detector.js';
+import type { ExecutionMode } from '../services/mode-registry-service.js';
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * Extended stop context with additional fields
+ */
+export interface ExtendedStopContext extends StopContext {
+  /** Session ID */
+  session_id?: string;
+  /** Session ID (camelCase variant) */
+  sessionId?: string;
+  /** Project path */
+  project_path?: string;
+  /** Project path (camelCase variant) */
+  projectPath?: string;
+  /** Current active mode */
+  active_mode?: 'analysis' | 'write' | 'review' | 'auto';
+  /** Current active mode (camelCase variant) */
+  activeMode?: 'analysis' | 'write' | 'review' | 'auto';
+  /** Whether there's an active workflow */
+  active_workflow?: boolean;
+  /** Whether there's an active workflow (camelCase variant) */
+  activeWorkflow?: boolean;
+}
+
+/**
+ * Result of stop handling
+ */
+export interface StopResult {
+  /** ALWAYS true - we never block stops */
+  continue: true;
+  /** Optional continuation message to inject */
+  message?: string;
+  /** Which handler was triggered */
+  mode?: 'context-limit' | 'user-abort' | 'active-workflow' | 'active-mode' | 'none';
+  /** Additional metadata */
+  metadata?: {
+    /** Reason for stop (from context) */
+    reason?: string;
+    /** Whether user requested stop */
+    userRequested?: boolean;
+    /** Session ID */
+    sessionId?: string;
+    /** Active mode if any */
+    activeMode?: string;
+    /** Whether workflow was active */
+    activeWorkflow?: boolean;
+  };
+}
+
+/**
+ * Options for StopHandler
+ */
+export interface StopHandlerOptions {
+  /** Whether to enable logging */
+  enableLogging?: boolean;
+  /** Custom message for workflow continuation */
+  workflowContinuationMessage?: string;
+  /** Custom message for mode continuation */
+  modeContinuationMessage?: string;
+  /** Project path for ModeRegistryService */
+  projectPath?: string;
+}
+
+// =============================================================================
+// Constants
+// =============================================================================
+
+/** Default workflow continuation message */
+const DEFAULT_WORKFLOW_MESSAGE = `[WORKFLOW CONTINUATION]
+An active workflow is in progress.
+
+If you intended to stop:
+- Use explicit cancellation command to exit cleanly
+- Otherwise, continue with your workflow tasks
+
+`;
+
+/** Default mode continuation message */
+const DEFAULT_MODE_MESSAGE = `[MODE CONTINUATION]
+An active mode is set for this session.
+
+Mode: {mode}
+
+Continue with your current task, or use cancellation command to exit.
+
+`;
+
+// =============================================================================
+// StopHandler
+// =============================================================================
+
+/**
+ * Handler for Stop hook events
+ *
+ * This handler implements Soft Enforcement: it never blocks stops,
+ * but injects continuation messages to encourage task completion.
+ */
+export class StopHandler {
+  private enableLogging: boolean;
+  private workflowContinuationMessage: string;
+  private modeContinuationMessage: string;
+  private projectPath?: string;
+
+  constructor(options: StopHandlerOptions = {}) {
+    this.enableLogging = options.enableLogging ?? false;
+    this.workflowContinuationMessage =
+      options.workflowContinuationMessage ?? DEFAULT_WORKFLOW_MESSAGE;
+    this.modeContinuationMessage =
+      options.modeContinuationMessage ?? DEFAULT_MODE_MESSAGE;
+    this.projectPath = options.projectPath;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Main Handler
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Handle a stop event
+   *
+   * Priority order:
+   *   1. context-limit: Always allow (deadlock prevention)
+   *   2. user-abort: Respect user intent
+   *   3. active-workflow: Inject continuation message
+   *   4. active-mode: Inject continuation message (via ModeRegistryService)
+   *
+   * @param context - Stop context from hook event
+   * @returns Stop result (always continue: true)
+   */
+  async handleStop(context?: ExtendedStopContext): Promise<StopResult> {
+    this.log('Handling stop event...');
+
+    // Extract common fields with both naming conventions
+    const sessionId = context?.session_id ?? context?.sessionId;
+    const activeMode = context?.active_mode ?? context?.activeMode;
+    const activeWorkflow = context?.active_workflow ?? context?.activeWorkflow;
+    const userRequested = context?.user_requested ?? context?.userRequested;
+
+    // Get stop reason
+    const reason = context?.stop_reason ?? context?.stopReason ?? '';
+    const endTurnReason = context?.end_turn_reason ?? context?.endTurnReason ?? '';
+    const fullReason = `${reason} ${endTurnReason}`.trim();
+
+    this.log(`Context: sessionId=${sessionId}, reason="${fullReason}", userRequested=${userRequested}`);
+
+    // Priority 1: Context Limit - CRITICAL: Never block
+    // Blocking context-limit stops causes deadlock (can't compact if can't stop)
+    if (isContextLimitStop(context)) {
+      this.log('Context limit detected - allowing stop');
+      return {
+        continue: true,
+        mode: 'context-limit',
+        metadata: {
+          reason: fullReason,
+          sessionId,
+          userRequested
+        }
+      };
+    }
+
+    // Priority 2: User Abort - Respect user intent
+    if (isUserAbort(context)) {
+      this.log('User abort detected - respecting user intent');
+      return {
+        continue: true,
+        mode: 'user-abort',
+        metadata: {
+          reason: fullReason,
+          userRequested: true,
+          sessionId
+        }
+      };
+    }
+
+    // Priority 3: Active Workflow - Inject continuation message
+    if (activeWorkflow) {
+      this.log('Active workflow detected - injecting continuation message');
+      return {
+        continue: true,
+        message: this.workflowContinuationMessage,
+        mode: 'active-workflow',
+        metadata: {
+          reason: fullReason,
+          sessionId,
+          activeWorkflow: true
+        }
+      };
+    }
+
+    // Priority 4: Active Mode - Check via ModeRegistryService
+    if (this.projectPath && sessionId) {
+      try {
+        const { ModeRegistryService } = await import('../services/mode-registry-service.js');
+        const modeRegistry = new ModeRegistryService({
+          projectPath: this.projectPath,
+          enableLogging: this.enableLogging
+        });
+
+        const activeModes = modeRegistry.getActiveModes(sessionId);
+        if (activeModes.length > 0) {
+          const primaryMode = activeModes[0];
+          const modeConfig = (await import('../services/mode-registry-service.js')).MODE_CONFIGS[primaryMode];
+          const modeName = modeConfig?.name ?? primaryMode;
+
+          this.log(`Active mode "${modeName}" detected via ModeRegistryService - injecting continuation message`);
+          const message = this.modeContinuationMessage.replace('{mode}', modeName);
+          return {
+            continue: true,
+            message,
+            mode: 'active-mode',
+            metadata: {
+              reason: fullReason,
+              sessionId,
+              activeMode: primaryMode
+            }
+          };
+        }
+      } catch (error) {
+        this.log(`Error checking mode registry: ${(error as Error).message}`);
+        // Fall through to check context-based active mode
+      }
+    }
+
+    // Fallback: Check active mode from context
+    if (activeMode) {
+      this.log(`Active mode "${activeMode}" detected from context - injecting continuation message`);
+      const message = this.modeContinuationMessage.replace('{mode}', String(activeMode));
+      return {
+        continue: true,
+        message,
+        mode: 'active-mode',
+        metadata: {
+          reason: fullReason,
+          sessionId,
+          activeMode: String(activeMode)
+        }
+      };
+    }
+
+    // Default: No special handling needed
+    this.log('No special handling needed - allowing stop');
+    return {
+      continue: true,
+      mode: 'none',
+      metadata: {
+        reason: fullReason,
+        sessionId,
+        userRequested
+      }
+    };
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Utility Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check if a stop should trigger continuation message
+   *
+   * @param context - Stop context
+   * @returns true if continuation message should be injected
+   */
+  async shouldInjectContinuation(context?: ExtendedStopContext): Promise<boolean> {
+    // Context limit and user abort don't get continuation
+    if (isContextLimitStop(context) || isUserAbort(context)) {
+      return false;
+    }
+
+    // Active workflow gets continuation
+    const activeWorkflow = context?.active_workflow ?? context?.activeWorkflow;
+    if (activeWorkflow) {
+      return true;
+    }
+
+    // Check via ModeRegistryService if projectPath is available
+    const sessionId = context?.session_id ?? context?.sessionId;
+    if (this.projectPath && sessionId) {
+      try {
+        const { ModeRegistryService } = await import('../services/mode-registry-service.js');
+        const modeRegistry = new ModeRegistryService({
+          projectPath: this.projectPath,
+          enableLogging: false
+        });
+
+        if (modeRegistry.isAnyModeActive(sessionId)) {
+          return true;
+        }
+      } catch {
+        // Fall through to context-based check
+      }
+    }
+
+    // Fallback: Check active mode from context
+    const activeMode = context?.active_mode ?? context?.activeMode;
+    return Boolean(activeMode);
+  }
+
+  /**
+   * Get the stop reason from context
+   *
+   * @param context - Stop context
+   * @returns Normalized stop reason
+   */
+  getStopReason(context?: ExtendedStopContext): string {
+    const reason = context?.stop_reason ?? context?.stopReason ?? '';
+    const endTurnReason = context?.end_turn_reason ?? context?.endTurnReason ?? '';
+    return `${reason} ${endTurnReason}`.trim() || 'unknown';
+  }
+
+  // ---------------------------------------------------------------------------
+  // Private: Utility Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Log a message if logging is enabled
+   */
+  private log(message: string): void {
+    if (this.enableLogging) {
+      const timestamp = new Date().toISOString();
+      console.log(`[StopHandler ${timestamp}] ${message}`);
+    }
+  }
+}
+
+// =============================================================================
+// Factory Function
+// =============================================================================
+
+/**
+ * Create a StopHandler instance
+ *
+ * @param options - Handler options
+ * @returns StopHandler instance
+ */
+export function createStopHandler(options?: StopHandlerOptions): StopHandler {
+  return new StopHandler(options);
+}
+
+// =============================================================================
+// Default Export
+// =============================================================================
+
+/** Default StopHandler instance */
+export const defaultStopHandler = new StopHandler();

ccw/src/core/hooks/user-abort-detector.ts

@@ -0,0 +1,194 @@
+/**
+ * UserAbortDetector - Detects user-initiated abort stops
+ *
+ * Detects if a stop was due to user abort (not natural completion).
+ * This allows hooks to gracefully handle user-initiated stops differently
+ * from automatic or system-initiated stops.
+ *
+ * NOTE: Per official Anthropic docs, the Stop hook "Does not run if
+ * the stoppage occurred due to a user interrupt." This means this
+ * detector may never receive user-abort contexts in practice.
+ * It is kept as defensive code in case the behavior changes.
+ */
+
+import type { StopContext } from './context-limit-detector.js';
+
+// Re-export StopContext for convenience
+export type { StopContext } from './context-limit-detector.js';
+
+/**
+ * Patterns that indicate user abort (exact match)
+ *
+ * These are short generic words that need exact matching to avoid
+ * false positives with substring matching (e.g., "cancel" in "cancelled_order").
+ */
+export const USER_ABORT_EXACT_PATTERNS: readonly string[] = [
+  'aborted',
+  'abort',
+  'cancel',
+  'interrupt'
+] as const;
+
+/**
+ * Patterns that indicate user abort (substring match)
+ *
+ * These are compound words that are safe for substring matching
+ * because they are unlikely to appear as parts of other words.
+ */
+export const USER_ABORT_SUBSTRING_PATTERNS: readonly string[] = [
+  'user_cancel',
+  'user_interrupt',
+  'ctrl_c',
+  'manual_stop'
+] as const;
+
+/**
+ * All user abort patterns combined
+ */
+export const USER_ABORT_PATTERNS: readonly string[] = [
+  ...USER_ABORT_EXACT_PATTERNS,
+  ...USER_ABORT_SUBSTRING_PATTERNS
+] as const;
+
+/**
+ * Check if a reason matches exact abort patterns
+ *
+ * @param reason - The reason string to check (should be lowercase)
+ * @returns true if the reason exactly matches an abort pattern
+ */
+function matchesExactPattern(reason: string): boolean {
+  return USER_ABORT_EXACT_PATTERNS.some(pattern => reason === pattern);
+}
+
+/**
+ * Check if a reason matches substring abort patterns
+ *
+ * @param reason - The reason string to check (should be lowercase)
+ * @returns true if the reason contains a substring abort pattern
+ */
+function matchesSubstringPattern(reason: string): boolean {
+  return USER_ABORT_SUBSTRING_PATTERNS.some(pattern => reason.includes(pattern));
+}
+
+/**
+ * Detect if stop was due to user abort (not natural completion)
+ *
+ * WARNING: These patterns are ASSUMED based on common conventions.
+ * As of 2025-01, Anthropic's Stop hook input schema does not document
+ * the exact stop_reason values. The patterns below are educated guesses:
+ *
+ * - user_cancel, user_interrupt: Likely user-initiated via UI
+ * - ctrl_c: Terminal interrupt (Ctrl+C)
+ * - manual_stop: Explicit stop button
+ * - abort, cancel, interrupt: Generic abort patterns
+ *
+ * If the detector fails to detect user aborts correctly, these patterns
+ * should be updated based on observed Claude Code behavior.
+ *
+ * @param context - The stop context from the hook event
+ * @returns true if the stop was due to user abort
+ */
+export function isUserAbort(context?: StopContext): boolean {
+  if (!context) return false;
+
+  // User explicitly requested stop (supports both camelCase and snake_case)
+  if (context.user_requested === true || context.userRequested === true) {
+    return true;
+  }
+
+  // Get reason from both field naming conventions
+  const reason = (context.stop_reason ?? context.stopReason ?? '').toLowerCase();
+
+  // Check exact patterns first (short words that could cause false positives)
+  if (matchesExactPattern(reason)) {
+    return true;
+  }
+
+  // Then check substring patterns (compound words safe for includes)
+  if (matchesSubstringPattern(reason)) {
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * Get the matching user abort pattern if any
+ *
+ * @param context - The stop context from the hook event
+ * @returns The matching pattern or null if no match
+ */
+export function getMatchingAbortPattern(context?: StopContext): string | null {
+  if (!context) return null;
+
+  // Check explicit user_requested flag first
+  if (context.user_requested === true || context.userRequested === true) {
+    return 'user_requested';
+  }
+
+  const reason = (context.stop_reason ?? context.stopReason ?? '').toLowerCase();
+
+  // Check exact patterns
+  for (const pattern of USER_ABORT_EXACT_PATTERNS) {
+    if (reason === pattern) {
+      return pattern;
+    }
+  }
+
+  // Check substring patterns
+  for (const pattern of USER_ABORT_SUBSTRING_PATTERNS) {
+    if (reason.includes(pattern)) {
+      return pattern;
+    }
+  }
+
+  return null;
+}
+
+/**
+ * Get all matching user abort patterns
+ *
+ * @param context - The stop context from the hook event
+ * @returns Array of matching patterns (may be empty)
+ */
+export function getAllMatchingAbortPatterns(context?: StopContext): string[] {
+  if (!context) return [];
+
+  const matches: string[] = [];
+
+  // Check explicit user_requested flag first
+  if (context.user_requested === true || context.userRequested === true) {
+    matches.push('user_requested');
+  }
+
+  const reason = (context.stop_reason ?? context.stopReason ?? '').toLowerCase();
+
+  // Check exact patterns
+  for (const pattern of USER_ABORT_EXACT_PATTERNS) {
+    if (reason === pattern) {
+      matches.push(pattern);
+    }
+  }
+
+  // Check substring patterns
+  for (const pattern of USER_ABORT_SUBSTRING_PATTERNS) {
+    if (reason.includes(pattern)) {
+      matches.push(pattern);
+    }
+  }
+
+  return Array.from(new Set(matches)); // Remove duplicates
+}
+
+/**
+ * Check if a stop should allow continuation
+ *
+ * User aborts should NOT force continuation - if the user explicitly
+ * stopped the session, we should respect that decision.
+ *
+ * @param context - The stop context from the hook event
+ * @returns true if continuation should be allowed (not a user abort)
+ */
+export function shouldAllowContinuation(context?: StopContext): boolean {
+  return !isUserAbort(context);
+}

ccw/src/core/mode-workflow-map.ts

@@ -0,0 +1,366 @@
+/**
+ * ModeWorkflowMap - Mode to Workflow Mapping
+ *
+ * Maps execution modes to their corresponding workflow types and provides
+ * workflow activation configuration for each mode.
+ *
+ * Mode -> Workflow Mappings:
+ *   - autopilot  -> unified-execute-with-file (autonomous multi-step execution)
+ *   - ralph      -> team-planex (research and analysis)
+ *   - ultrawork  -> test-fix (ultra-focused work with test feedback)
+ *   - swarm      -> parallel-agents (multi-agent parallel execution)
+ *   - pipeline   -> lite-plan (sequential pipeline execution)
+ *   - team       -> team-iterdev (team collaboration)
+ *   - ultraqa    -> test-fix (QA-focused test cycles)
+ */
+
+import { ExecutionMode, MODE_CONFIGS } from './services/mode-registry-service.js';
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * Workflow types supported by the system
+ */
+export type WorkflowType =
+  | 'unified-execute-with-file'
+  | 'team-planex'
+  | 'test-fix'
+  | 'parallel-agents'
+  | 'lite-plan'
+  | 'team-iterdev';
+
+/**
+ * Configuration for workflow activation
+ */
+export interface WorkflowActivationConfig {
+  /** The workflow type to activate */
+  workflowType: WorkflowType;
+  /** Whether this workflow requires session persistence */
+  requiresPersistence: boolean;
+  /** Default execution mode for the workflow */
+  defaultExecutionMode: 'analysis' | 'write' | 'auto';
+  /** Whether parallel execution is supported */
+  supportsParallel: boolean;
+  /** Maximum concurrent tasks (for parallel workflows) */
+  maxConcurrentTasks?: number;
+  /** Description of the workflow */
+  description: string;
+  /** Required context keys for activation */
+  requiredContext?: string[];
+}
+
+/**
+ * Context passed during workflow activation
+ */
+export interface WorkflowActivationContext {
+  /** Session ID for the workflow */
+  sessionId: string;
+  /** Project root path */
+  projectPath: string;
+  /** User prompt or task description */
+  prompt?: string;
+  /** Additional context data */
+  metadata?: Record<string, unknown>;
+}
+
+/**
+ * Result of workflow activation
+ */
+export interface WorkflowActivationResult {
+  /** Whether activation was successful */
+  success: boolean;
+  /** The session ID (may be new or existing) */
+  sessionId: string;
+  /** The activated workflow type */
+  workflowType: WorkflowType;
+  /** Error message if activation failed */
+  error?: string;
+}
+
+// =============================================================================
+// Constants
+// =============================================================================
+
+/**
+ * Mode to Workflow mapping configuration
+ *
+ * Each mode maps to a specific workflow type with its activation config.
+ */
+export const MODE_WORKFLOW_MAP: Record<ExecutionMode, WorkflowActivationConfig> = {
+  /**
+   * Autopilot Mode -> unified-execute-with-file
+   * Autonomous execution of multi-step tasks with file-based state persistence.
+   */
+  autopilot: {
+    workflowType: 'unified-execute-with-file',
+    requiresPersistence: true,
+    defaultExecutionMode: 'write',
+    supportsParallel: false,
+    description: 'Autonomous multi-step task execution with file-based state',
+    requiredContext: ['prompt']
+  },
+
+  /**
+   * Ralph Mode -> team-planex
+   * Research and Analysis Learning Pattern Handler for iterative exploration.
+   */
+  ralph: {
+    workflowType: 'team-planex',
+    requiresPersistence: true,
+    defaultExecutionMode: 'analysis',
+    supportsParallel: false,
+    description: 'Research and analysis pattern handler for iterative exploration'
+  },
+
+  /**
+   * Ultrawork Mode -> test-fix
+   * Ultra-focused work mode with test-feedback loop.
+   */
+  ultrawork: {
+    workflowType: 'test-fix',
+    requiresPersistence: true,
+    defaultExecutionMode: 'write',
+    supportsParallel: false,
+    description: 'Ultra-focused work mode with test-driven feedback loop'
+  },
+
+  /**
+   * Swarm Mode -> parallel-agents
+   * Multi-agent parallel execution for distributed task processing.
+   */
+  swarm: {
+    workflowType: 'parallel-agents',
+    requiresPersistence: true,
+    defaultExecutionMode: 'write',
+    supportsParallel: true,
+    maxConcurrentTasks: 5,
+    description: 'Multi-agent parallel execution for distributed tasks'
+  },
+
+  /**
+   * Pipeline Mode -> lite-plan
+   * Sequential pipeline execution for stage-based workflows.
+   */
+  pipeline: {
+    workflowType: 'lite-plan',
+    requiresPersistence: true,
+    defaultExecutionMode: 'write',
+    supportsParallel: false,
+    description: 'Sequential pipeline execution for stage-based workflows'
+  },
+
+  /**
+   * Team Mode -> team-iterdev
+   * Team collaboration mode for iterative development.
+   */
+  team: {
+    workflowType: 'team-iterdev',
+    requiresPersistence: true,
+    defaultExecutionMode: 'write',
+    supportsParallel: true,
+    maxConcurrentTasks: 3,
+    description: 'Team collaboration mode for iterative development'
+  },
+
+  /**
+   * UltraQA Mode -> test-fix
+   * QA-focused test cycles with iterative quality improvements.
+   */
+  ultraqa: {
+    workflowType: 'test-fix',
+    requiresPersistence: true,
+    defaultExecutionMode: 'write',
+    supportsParallel: false,
+    description: 'QA-focused test cycles with iterative quality improvements'
+  }
+};
+
+// =============================================================================
+// Helper Functions
+// =============================================================================
+
+/**
+ * Get the workflow type for a given execution mode
+ *
+ * @param mode - The execution mode
+ * @returns The corresponding workflow type, or undefined if not found
+ */
+export function getWorkflowForMode(mode: ExecutionMode): WorkflowType | undefined {
+  const config = MODE_WORKFLOW_MAP[mode];
+  return config?.workflowType;
+}
+
+/**
+ * Get the activation configuration for a given execution mode
+ *
+ * @param mode - The execution mode
+ * @returns The activation configuration, or undefined if not found
+ */
+export function getActivationConfig(mode: ExecutionMode): WorkflowActivationConfig | undefined {
+  return MODE_WORKFLOW_MAP[mode];
+}
+
+/**
+ * Get all modes that map to a specific workflow type
+ *
+ * @param workflowType - The workflow type to filter by
+ * @returns Array of execution modes that use this workflow
+ */
+export function getModesForWorkflow(workflowType: WorkflowType): ExecutionMode[] {
+  return (Object.entries(MODE_WORKFLOW_MAP) as [ExecutionMode, WorkflowActivationConfig][])
+    .filter(([, config]) => config.workflowType === workflowType)
+    .map(([mode]) => mode);
+}
+
+/**
+ * Check if a mode supports parallel execution
+ *
+ * @param mode - The execution mode
+ * @returns true if the mode supports parallel execution
+ */
+export function isParallelMode(mode: ExecutionMode): boolean {
+  const config = MODE_WORKFLOW_MAP[mode];
+  return config?.supportsParallel ?? false;
+}
+
+/**
+ * Get the maximum concurrent tasks for a parallel mode
+ *
+ * @param mode - The execution mode
+ * @returns Maximum concurrent tasks, or 1 if not a parallel mode
+ */
+export function getMaxConcurrentTasks(mode: ExecutionMode): number {
+  const config = MODE_WORKFLOW_MAP[mode];
+  if (!config?.supportsParallel) {
+    return 1;
+  }
+  return config.maxConcurrentTasks ?? 3;
+}
+
+/**
+ * Validate that required context is present for mode activation
+ *
+ * @param mode - The execution mode
+ * @param context - The activation context
+ * @returns Object with valid flag and missing keys if any
+ */
+export function validateActivationContext(
+  mode: ExecutionMode,
+  context: WorkflowActivationContext
+): { valid: boolean; missingKeys: string[] } {
+  const config = MODE_WORKFLOW_MAP[mode];
+  const requiredKeys = config?.requiredContext ?? [];
+  const missingKeys: string[] = [];
+
+  for (const key of requiredKeys) {
+    if (key === 'prompt' && !context.prompt) {
+      missingKeys.push(key);
+    } else if (key === 'sessionId' && !context.sessionId) {
+      missingKeys.push(key);
+    } else if (key === 'projectPath' && !context.projectPath) {
+      missingKeys.push(key);
+    } else if (key.startsWith('metadata.') && context.metadata) {
+      const metaKey = key.substring('metadata.'.length);
+      if (!(metaKey in context.metadata)) {
+        missingKeys.push(key);
+      }
+    }
+  }
+
+  return {
+    valid: missingKeys.length === 0,
+    missingKeys
+  };
+}
+
+/**
+ * Activate a workflow for a given mode
+ *
+ * This function creates the necessary session state and returns
+ * activation result. The actual workflow execution is handled
+ * by the respective workflow handlers.
+ *
+ * @param mode - The execution mode to activate
+ * @param context - The activation context
+ * @returns Promise resolving to activation result
+ */
+export async function activateWorkflowForMode(
+  mode: ExecutionMode,
+  context: WorkflowActivationContext
+): Promise<WorkflowActivationResult> {
+  const config = MODE_WORKFLOW_MAP[mode];
+  const modeConfig = MODE_CONFIGS[mode];
+
+  // Validate mode exists
+  if (!config) {
+    return {
+      success: false,
+      sessionId: context.sessionId,
+      workflowType: 'unified-execute-with-file', // Default fallback
+      error: `Unknown mode: ${mode}`
+    };
+  }
+
+  // Validate required context
+  const validation = validateActivationContext(mode, context);
+  if (!validation.valid) {
+    return {
+      success: false,
+      sessionId: context.sessionId,
+      workflowType: config.workflowType,
+      error: `Missing required context: ${validation.missingKeys.join(', ')}`
+    };
+  }
+
+  // Validate session ID
+  if (!context.sessionId) {
+    return {
+      success: false,
+      sessionId: '',
+      workflowType: config.workflowType,
+      error: 'Session ID is required for workflow activation'
+    };
+  }
+
+  // Return success result
+  // Note: Actual session state persistence is handled by ModeRegistryService
+  return {
+    success: true,
+    sessionId: context.sessionId,
+    workflowType: config.workflowType
+  };
+}
+
+/**
+ * Get a human-readable description for a mode's workflow
+ *
+ * @param mode - The execution mode
+ * @returns Description string
+ */
+export function getWorkflowDescription(mode: ExecutionMode): string {
+  const config = MODE_WORKFLOW_MAP[mode];
+  const modeConfig = MODE_CONFIGS[mode];
+  return config?.description ?? modeConfig?.description ?? `Workflow for ${mode} mode`;
+}
+
+/**
+ * List all available mode-to-workflow mappings
+ *
+ * @returns Array of mode-workflow mapping entries
+ */
+export function listModeWorkflowMappings(): Array<{
+  mode: ExecutionMode;
+  workflowType: WorkflowType;
+  description: string;
+  supportsParallel: boolean;
+}> {
+  return (Object.entries(MODE_WORKFLOW_MAP) as [ExecutionMode, WorkflowActivationConfig][])
+    .map(([mode, config]) => ({
+      mode,
+      workflowType: config.workflowType,
+      description: config.description,
+      supportsParallel: config.supportsParallel
+    }));
+}

ccw/src/core/routes/hooks-routes.ts

@@ -1,6 +1,26 @@
 /**
  * Hooks Routes Module
  * Handles all hooks-related API endpoints
+ *
+ * ## API Endpoints
+ *
+ * ### Active Endpoints
+ * - POST /api/hook - Main hook endpoint for Claude Code notifications
+ *   - Handles: session-start, context, CLI events, A2UI surfaces
+ * - POST /api/hook/ccw-exec - Execute CCW CLI commands and parse output
+ * - GET /api/hooks - Get hooks configuration from global and project settings
+ * - POST /api/hooks - Save a hook to settings
+ * - DELETE /api/hooks - Delete a hook from settings
+ *
+ * ### Deprecated Endpoints (will be removed in v2.0.0)
+ * - POST /api/hook/session-context - Use `ccw hook session-context --stdin` instead
+ * - POST /api/hook/ccw-status - Use /api/hook/ccw-exec with command=parse-status
+ *
+ * ## Service Layer
+ * All endpoints use unified services:
+ * - HookContextService: Context generation for session-start and per-prompt hooks
+ * - SessionStateService: Session state tracking and persistence
+ * - SessionEndService: Background task management for session-end events
  */
 import { readFileSync, writeFileSync, existsSync, mkdirSync } from 'fs';
 import { join, dirname } from 'path';
@@ -235,26 +255,27 @@ export async function handleHooksRoutes(ctx: HooksRouteContext): Promise<boolean
       if (type === 'session-start' || type === 'context') {
         try {
           const projectPath = url.searchParams.get('path') || initialPath;
-          const { SessionClusteringService } = await import('../session-clustering-service.js');
-          const clusteringService = new SessionClusteringService(projectPath);
+
+          // Use HookContextService for unified context generation
+          const { HookContextService } = await import('../services/hook-context-service.js');
+          const contextService = new HookContextService({ projectPath });
 
           const format = url.searchParams.get('format') || 'markdown';
+          const prompt = typeof extraData.prompt === 'string' ? extraData.prompt : undefined;
 
-          // Pass type and prompt to getProgressiveIndex
-          // session-start: returns recent sessions by time
-          // context: returns intent-matched sessions based on prompt
-          const index = await clusteringService.getProgressiveIndex({
-            type: type as 'session-start' | 'context',
-            sessionId: resolvedSessionId,
-            prompt: typeof extraData.prompt === 'string' ? extraData.prompt : undefined // Pass user prompt for intent matching
+          // Build context using the service
+          const result = await contextService.buildPromptContext({
+            sessionId: resolvedSessionId || '',
+            prompt,
+            projectId: projectPath
           });
 
           // Return context directly
           return {
             success: true,
-            type: 'context',
+            type: result.type,
             format,
-            content: index,
+            content: result.content,
             sessionId: resolvedSessionId
           };
         } catch (error) {
@@ -336,84 +357,56 @@ export async function handleHooksRoutes(ctx: HooksRouteContext): Promise<boolean
   }
 
   // API: Unified Session Context endpoint (Progressive Disclosure)
-  // DEPRECATED: Use CLI command `ccw hook session-context --stdin` instead.
-  // This endpoint now uses file-based state (shared with CLI) for consistency.
+  // @DEPRECATED - This endpoint is deprecated and will be removed in a future version.
+  // Migration: Use CLI command `ccw hook session-context --stdin` instead.
+  // This endpoint now uses HookContextService for consistency with CLI.
   // - First prompt: returns cluster-based session overview
   // - Subsequent prompts: returns intent-matched sessions based on prompt
   if (pathname === '/api/hook/session-context' && req.method === 'POST') {
+    // Add deprecation warning header
+    res.setHeader('X-Deprecated', 'true');
+    res.setHeader('X-Deprecation-Message', 'Use CLI command "ccw hook session-context --stdin" instead. This endpoint will be removed in v2.0.0');
+    res.setHeader('X-Migration-Guide', 'https://github.com/ccw-project/ccw/blob/main/docs/migration-hooks.md#session-context');
+
     handlePostRequest(req, res, async (body) => {
+      // Log deprecation warning
+      console.warn('[DEPRECATED] /api/hook/session-context is deprecated. Use "ccw hook session-context --stdin" instead.');
+
       const { sessionId, prompt } = body as { sessionId?: string; prompt?: string };
 
       if (!sessionId) {
         return {
           success: true,
           content: '',
-          error: 'sessionId is required'
+          error: 'sessionId is required',
+          _deprecated: true,
+          _migration: 'Use "ccw hook session-context --stdin"'
         };
       }
 
       try {
         const projectPath = url.searchParams.get('path') || initialPath;
-        const { SessionClusteringService } = await import('../session-clustering-service.js');
-        const clusteringService = new SessionClusteringService(projectPath);
 
-        // Use file-based session state (shared with CLI hook.ts)
-        const sessionStateDir = join(homedir(), '.claude', '.ccw-sessions');
-        const sessionStateFile = join(sessionStateDir, `session-${sessionId}.json`);
-        
-        let existingState: { firstLoad: string; loadCount: number; lastPrompt?: string } | null = null;
-        if (existsSync(sessionStateFile)) {
-          try {
-            existingState = JSON.parse(readFileSync(sessionStateFile, 'utf-8'));
-          } catch {
-            existingState = null;
-          }
-        }
-        
-        const isFirstPrompt = !existingState;
+        // Use HookContextService for unified context generation
+        const { HookContextService } = await import('../services/hook-context-service.js');
+        const contextService = new HookContextService({ projectPath });
 
-        // Update session state (file-based)
-        const newState = isFirstPrompt
-          ? { firstLoad: new Date().toISOString(), loadCount: 1, lastPrompt: prompt }
-          : { ...existingState!, loadCount: existingState!.loadCount + 1, lastPrompt: prompt };
-        
-        if (!existsSync(sessionStateDir)) {
-          mkdirSync(sessionStateDir, { recursive: true });
-        }
-        writeFileSync(sessionStateFile, JSON.stringify(newState, null, 2));
-
-        // Determine which type of context to return
-        let contextType: 'session-start' | 'context';
-        let content: string;
-
-        if (isFirstPrompt) {
-          // First prompt: return session overview with clusters
-          contextType = 'session-start';
-          content = await clusteringService.getProgressiveIndex({
-            type: 'session-start',
-            sessionId
-          });
-        } else if (prompt && prompt.trim().length > 0) {
-          // Subsequent prompts with content: return intent-matched sessions
-          contextType = 'context';
-          content = await clusteringService.getProgressiveIndex({
-            type: 'context',
-            sessionId,
-            prompt
-          });
-        } else {
-          // Subsequent prompts without content: return minimal context
-          contextType = 'context';
-          content = ''; // No context needed for empty prompts
-        }
+        // Build context using the service
+        const result = await contextService.buildPromptContext({
+          sessionId,
+          prompt,
+          projectId: projectPath
+        });
 
         return {
           success: true,
-          type: contextType,
-          isFirstPrompt,
-          loadCount: newState.loadCount,
-          content,
-          sessionId
+          type: result.type,
+          isFirstPrompt: result.isFirstPrompt,
+          loadCount: result.state.loadCount,
+          content: result.content,
+          sessionId,
+          _deprecated: true,
+          _migration: 'Use "ccw hook session-context --stdin"'
         };
       } catch (error) {
         console.error('[Hooks] Failed to generate session context:', error);
@@ -421,7 +414,9 @@ export async function handleHooksRoutes(ctx: HooksRouteContext): Promise<boolean
           success: true,
           content: '',
           sessionId,
-          error: (error as Error).message
+          error: (error as Error).message,
+          _deprecated: true,
+          _migration: 'Use "ccw hook session-context --stdin"'
         };
       }
     });
@@ -474,8 +469,16 @@ export async function handleHooksRoutes(ctx: HooksRouteContext): Promise<boolean
     return true;
   }
 
-  // API: Parse CCW status.json and return formatted status (fallback)
+  // API: Parse CCW status.json and return formatted status
+  // @DEPRECATED - Use /api/hook/ccw-exec with command=parse-status instead.
+  // This endpoint is kept for backward compatibility but will be removed.
   if (pathname === '/api/hook/ccw-status' && req.method === 'POST') {
+    // Add deprecation warning header
+    res.setHeader('X-Deprecated', 'true');
+    res.setHeader('X-Deprecation-Message', 'Use /api/hook/ccw-exec with command=parse-status instead. This endpoint will be removed in v2.0.0');
+
+    console.warn('[DEPRECATED] /api/hook/ccw-status is deprecated. Use /api/hook/ccw-exec instead.');
+
     handlePostRequest(req, res, async (body) => {
       if (typeof body !== 'object' || body === null) {
         return { error: 'Invalid request body', status: 400 };
@@ -487,51 +490,30 @@ export async function handleHooksRoutes(ctx: HooksRouteContext): Promise<boolean
         return { error: 'filePath is required', status: 400 };
       }
 
-      // Check if this is a CCW status.json file
-      if (!filePath.includes('status.json') ||
-          !filePath.match(/\.(ccw|ccw-coordinator|ccw-debug)\//)) {
-        return { success: false, message: 'Not a CCW status file' };
-      }
-
+      // Delegate to ccw-exec for unified handling
       try {
-        // Read and parse status.json
-        if (!existsSync(filePath)) {
-          return { success: false, message: 'Status file not found' };
+        const result = await executeCliCommand('ccw', ['hook', 'parse-status', filePath]);
+
+        if (result.success) {
+          return {
+            success: true,
+            message: result.output,
+            _deprecated: true,
+            _migration: 'Use /api/hook/ccw-exec with command=parse-status'
+          };
+        } else {
+          return {
+            success: false,
+            error: result.error,
+            _deprecated: true
+          };
         }
-
-        const statusContent = readFileSync(filePath, 'utf8');
-        const status = JSON.parse(statusContent);
-
-        // Extract key information
-        const sessionId = status.session_id || 'unknown';
-        const workflow = status.workflow || status.mode || 'unknown';
-
-        // Find current command (running or last completed)
-        let currentCommand = status.command_chain?.find((cmd: { status: string }) => cmd.status === 'running')?.command;
-        if (!currentCommand) {
-          const completed = status.command_chain?.filter((cmd: { status: string }) => cmd.status === 'completed');
-          currentCommand = completed?.[completed.length - 1]?.command || 'unknown';
-        }
-
-        // Find next command (first pending)
-        const nextCommand = status.command_chain?.find((cmd: { status: string }) => cmd.status === 'pending')?.command || '无';
-
-        // Format status message
-        const message = `📋 CCW Status [${sessionId}] (${workflow}): 当前处于 ${currentCommand}，下一个命令 ${nextCommand}`;
-
-        return {
-          success: true,
-          message,
-          sessionId,
-          workflow,
-          currentCommand,
-          nextCommand
-        };
       } catch (error) {
         console.error('[Hooks] Failed to parse CCW status:', error);
         return {
           success: false,
-          error: (error as Error).message
+          error: (error as Error).message,
+          _deprecated: true
         };
       }
     });

ccw/src/core/services/checkpoint-service.ts

@@ -0,0 +1,565 @@
+/**
+ * CheckpointService - Session Checkpoint Management
+ *
+ * Creates and manages session checkpoints for state preservation during
+ * context compaction and workflow transitions.
+ *
+ * Features:
+ *   - Checkpoint creation with workflow and mode state
+ *   - Checkpoint storage in .workflow/checkpoints/
+ *   - Automatic cleanup of old checkpoints (keeps last 10)
+ *   - Recovery message formatting for context injection
+ *
+ * Based on oh-my-claudecode pre-compact pattern.
+ */
+
+import {
+  existsSync,
+  readFileSync,
+  writeFileSync,
+  mkdirSync,
+  readdirSync,
+  statSync,
+  unlinkSync
+} from 'fs';
+import { join, basename } from 'path';
+import { ExecutionMode, MODE_CONFIGS } from './mode-registry-service.js';
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * Checkpoint trigger type
+ */
+export type CheckpointTrigger = 'manual' | 'auto' | 'compact' | 'mode-switch' | 'session-end';
+
+/**
+ * Workflow state snapshot
+ */
+export interface WorkflowStateSnapshot {
+  /** Workflow type identifier */
+  type: string;
+  /** Current phase of the workflow */
+  phase: string;
+  /** Task IDs in pending state */
+  pending: string[];
+  /** Task IDs in completed state */
+  completed: string[];
+  /** Additional workflow metadata */
+  metadata?: Record<string, unknown>;
+}
+
+/**
+ * Mode state snapshot for a single mode
+ */
+export interface ModeStateSnapshot {
+  /** Whether the mode is active */
+  active: boolean;
+  /** Mode-specific phase or stage */
+  phase?: string;
+  /** ISO timestamp when mode was activated */
+  activatedAt?: string;
+  /** Additional mode-specific data */
+  data?: Record<string, unknown>;
+}
+
+/**
+ * Memory context snapshot
+ */
+export interface MemoryContextSnapshot {
+  /** Brief summary of accumulated context */
+  summary: string;
+  /** Key entities identified in the session */
+  keyEntities: string[];
+  /** Important decisions made */
+  decisions?: string[];
+  /** Open questions or blockers */
+  openQuestions?: string[];
+}
+
+/**
+ * Full checkpoint data structure
+ */
+export interface Checkpoint {
+  /** Unique checkpoint ID (timestamp-sessionId) */
+  id: string;
+  /** ISO timestamp of checkpoint creation */
+  created_at: string;
+  /** What triggered the checkpoint */
+  trigger: CheckpointTrigger;
+  /** Session ID this checkpoint belongs to */
+  session_id: string;
+  /** Project path */
+  project_path: string;
+  /** Workflow state snapshot */
+  workflow_state: WorkflowStateSnapshot | null;
+  /** Active mode states */
+  mode_states: Partial<Record<ExecutionMode, ModeStateSnapshot>>;
+  /** Memory context summary */
+  memory_context: MemoryContextSnapshot | null;
+  /** TODO summary if available */
+  todo_summary?: {
+    pending: number;
+    in_progress: number;
+    completed: number;
+  };
+}
+
+/**
+ * Checkpoint metadata for listing
+ */
+export interface CheckpointMeta {
+  /** Checkpoint ID */
+  id: string;
+  /** Creation timestamp */
+  created_at: string;
+  /** Session ID */
+  session_id: string;
+  /** Trigger type */
+  trigger: CheckpointTrigger;
+  /** File path */
+  path: string;
+}
+
+/**
+ * Options for checkpoint service
+ */
+export interface CheckpointServiceOptions {
+  /** Project root path */
+  projectPath: string;
+  /** Maximum checkpoints to keep per session (default: 10) */
+  maxCheckpointsPerSession?: number;
+  /** Enable logging */
+  enableLogging?: boolean;
+}
+
+// =============================================================================
+// Constants
+// =============================================================================
+
+/** Default maximum checkpoints to keep per session */
+const DEFAULT_MAX_CHECKPOINTS = 10;
+
+/** Checkpoint directory name within .workflow */
+const CHECKPOINT_DIR_NAME = 'checkpoints';
+
+// =============================================================================
+// CheckpointService Class
+// =============================================================================
+
+/**
+ * Service for managing session checkpoints
+ */
+export class CheckpointService {
+  private projectPath: string;
+  private checkpointsDir: string;
+  private maxCheckpoints: number;
+  private enableLogging: boolean;
+
+  constructor(options: CheckpointServiceOptions) {
+    this.projectPath = options.projectPath;
+    this.checkpointsDir = join(this.projectPath, '.workflow', CHECKPOINT_DIR_NAME);
+    this.maxCheckpoints = options.maxCheckpointsPerSession ?? DEFAULT_MAX_CHECKPOINTS;
+    this.enableLogging = options.enableLogging ?? false;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Checkpoint Creation
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Create a checkpoint for a session
+   *
+   * @param sessionId - The session ID
+   * @param trigger - What triggered the checkpoint
+   * @param options - Optional additional data
+   * @returns Promise resolving to the created checkpoint
+   */
+  async createCheckpoint(
+    sessionId: string,
+    trigger: CheckpointTrigger,
+    options?: {
+      workflowState?: WorkflowStateSnapshot | null;
+      modeStates?: Partial<Record<ExecutionMode, ModeStateSnapshot>>;
+      memoryContext?: MemoryContextSnapshot | null;
+      todoSummary?: { pending: number; in_progress: number; completed: number };
+    }
+  ): Promise<Checkpoint> {
+    const timestamp = new Date().toISOString();
+    const checkpointId = this.generateCheckpointId(sessionId, timestamp);
+
+    const checkpoint: Checkpoint = {
+      id: checkpointId,
+      created_at: timestamp,
+      trigger,
+      session_id: sessionId,
+      project_path: this.projectPath,
+      workflow_state: options?.workflowState ?? null,
+      mode_states: options?.modeStates ?? {},
+      memory_context: options?.memoryContext ?? null,
+      todo_summary: options?.todoSummary
+    };
+
+    this.log(`Created checkpoint ${checkpointId} for session ${sessionId} (trigger: ${trigger})`);
+    return checkpoint;
+  }
+
+  /**
+   * Save a checkpoint to disk
+   *
+   * @param checkpoint - The checkpoint to save
+   * @returns The checkpoint ID
+   */
+  async saveCheckpoint(checkpoint: Checkpoint): Promise<string> {
+    this.ensureCheckpointsDir();
+
+    const filename = `${checkpoint.id}.json`;
+    const filepath = join(this.checkpointsDir, filename);
+
+    try {
+      writeFileSync(filepath, JSON.stringify(checkpoint, null, 2), 'utf-8');
+      this.log(`Saved checkpoint to ${filepath}`);
+
+      // Clean up old checkpoints for this session
+      await this.cleanupOldCheckpoints(checkpoint.session_id);
+
+      return checkpoint.id;
+    } catch (error) {
+      this.log(`Error saving checkpoint: ${(error as Error).message}`);
+      throw error;
+    }
+  }
+
+  /**
+   * Load a checkpoint from disk
+   *
+   * @param checkpointId - The checkpoint ID to load
+   * @returns The checkpoint or null if not found
+   */
+  async loadCheckpoint(checkpointId: string): Promise<Checkpoint | null> {
+    const filepath = join(this.checkpointsDir, `${checkpointId}.json`);
+
+    if (!existsSync(filepath)) {
+      this.log(`Checkpoint not found: ${checkpointId}`);
+      return null;
+    }
+
+    try {
+      const content = readFileSync(filepath, 'utf-8');
+      const checkpoint = JSON.parse(content) as Checkpoint;
+      this.log(`Loaded checkpoint ${checkpointId}`);
+      return checkpoint;
+    } catch (error) {
+      this.log(`Error loading checkpoint ${checkpointId}: ${(error as Error).message}`);
+      return null;
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Checkpoint Listing
+  // ---------------------------------------------------------------------------
+
+  /**
+   * List all checkpoints, optionally filtered by session
+   *
+   * @param sessionId - Optional session ID to filter by
+   * @returns Array of checkpoint metadata
+   */
+  async listCheckpoints(sessionId?: string): Promise<CheckpointMeta[]> {
+    if (!existsSync(this.checkpointsDir)) {
+      return [];
+    }
+
+    try {
+      const files = readdirSync(this.checkpointsDir)
+        .filter(f => f.endsWith('.json'))
+        .map(f => join(this.checkpointsDir, f));
+
+      const checkpoints: CheckpointMeta[] = [];
+
+      for (const filepath of files) {
+        try {
+          const content = readFileSync(filepath, 'utf-8');
+          const checkpoint = JSON.parse(content) as Checkpoint;
+
+          // Filter by session if provided
+          if (sessionId && checkpoint.session_id !== sessionId) {
+            continue;
+          }
+
+          checkpoints.push({
+            id: checkpoint.id,
+            created_at: checkpoint.created_at,
+            session_id: checkpoint.session_id,
+            trigger: checkpoint.trigger,
+            path: filepath
+          });
+        } catch {
+          // Skip invalid checkpoint files
+        }
+      }
+
+      // Sort by creation time (newest first)
+      checkpoints.sort((a, b) =>
+        new Date(b.created_at).getTime() - new Date(a.created_at).getTime()
+      );
+
+      return checkpoints;
+    } catch (error) {
+      this.log(`Error listing checkpoints: ${(error as Error).message}`);
+      return [];
+    }
+  }
+
+  /**
+   * Get the most recent checkpoint for a session
+   *
+   * @param sessionId - The session ID
+   * @returns The most recent checkpoint or null
+   */
+  async getLatestCheckpoint(sessionId: string): Promise<Checkpoint | null> {
+    const checkpoints = await this.listCheckpoints(sessionId);
+    if (checkpoints.length === 0) {
+      return null;
+    }
+
+    return this.loadCheckpoint(checkpoints[0].id);
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Recovery Message Formatting
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Format a checkpoint as a recovery message for context injection
+   *
+   * @param checkpoint - The checkpoint to format
+   * @returns Formatted markdown string
+   */
+  formatRecoveryMessage(checkpoint: Checkpoint): string {
+    const lines: string[] = [
+      '# Session Checkpoint Recovery',
+      '',
+      `**Checkpoint ID:** ${checkpoint.id}`,
+      `**Created:** ${checkpoint.created_at}`,
+      `**Trigger:** ${checkpoint.trigger}`,
+      `**Session:** ${checkpoint.session_id}`,
+      ''
+    ];
+
+    // Workflow state section
+    if (checkpoint.workflow_state) {
+      const ws = checkpoint.workflow_state;
+      lines.push('## Workflow State');
+      lines.push('');
+      lines.push(`- **Type:** ${ws.type}`);
+      lines.push(`- **Phase:** ${ws.phase}`);
+      if (ws.pending.length > 0) {
+        lines.push(`- **Pending Tasks:** ${ws.pending.length}`);
+      }
+      if (ws.completed.length > 0) {
+        lines.push(`- **Completed Tasks:** ${ws.completed.length}`);
+      }
+      lines.push('');
+    }
+
+    // Active modes section
+    const activeModes = Object.entries(checkpoint.mode_states)
+      .filter(([, state]) => state.active);
+
+    if (activeModes.length > 0) {
+      lines.push('## Active Modes');
+      lines.push('');
+
+      for (const [mode, state] of activeModes) {
+        const modeConfig = MODE_CONFIGS[mode as ExecutionMode];
+        const modeName = modeConfig?.name ?? mode;
+        lines.push(`- **${modeName}**`);
+        if (state.phase) {
+          lines.push(`  - Phase: ${state.phase}`);
+        }
+        if (state.activatedAt) {
+          const age = Math.round(
+            (Date.now() - new Date(state.activatedAt).getTime()) / 60000
+          );
+          lines.push(`  - Active for: ${age} minutes`);
+        }
+      }
+      lines.push('');
+    }
+
+    // TODO summary section
+    if (checkpoint.todo_summary) {
+      const todo = checkpoint.todo_summary;
+      const total = todo.pending + todo.in_progress + todo.completed;
+
+      if (total > 0) {
+        lines.push('## TODO Summary');
+        lines.push('');
+        lines.push(`- Pending: ${todo.pending}`);
+        lines.push(`- In Progress: ${todo.in_progress}`);
+        lines.push(`- Completed: ${todo.completed}`);
+        lines.push('');
+      }
+    }
+
+    // Memory context section
+    if (checkpoint.memory_context) {
+      const mem = checkpoint.memory_context;
+      lines.push('## Context Memory');
+      lines.push('');
+
+      if (mem.summary) {
+        lines.push(mem.summary);
+        lines.push('');
+      }
+
+      if (mem.keyEntities.length > 0) {
+        lines.push(`**Key Entities:** ${mem.keyEntities.join(', ')}`);
+        lines.push('');
+      }
+
+      if (mem.decisions && mem.decisions.length > 0) {
+        lines.push('**Decisions Made:**');
+        for (const decision of mem.decisions) {
+          lines.push(`- ${decision}`);
+        }
+        lines.push('');
+      }
+
+      if (mem.openQuestions && mem.openQuestions.length > 0) {
+        lines.push('**Open Questions:**');
+        for (const question of mem.openQuestions) {
+          lines.push(`- ${question}`);
+        }
+        lines.push('');
+      }
+    }
+
+    // Recovery instructions
+    lines.push('---');
+    lines.push('');
+    lines.push('*This checkpoint was created to preserve session state.*');
+    lines.push('*Review the information above to resume work effectively.*');
+
+    return lines.join('\n');
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Cleanup
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Delete a specific checkpoint
+   *
+   * @param checkpointId - The checkpoint ID to delete
+   * @returns true if deleted successfully
+   */
+  async deleteCheckpoint(checkpointId: string): Promise<boolean> {
+    const filepath = join(this.checkpointsDir, `${checkpointId}.json`);
+
+    if (!existsSync(filepath)) {
+      return false;
+    }
+
+    try {
+      unlinkSync(filepath);
+      this.log(`Deleted checkpoint ${checkpointId}`);
+      return true;
+    } catch (error) {
+      this.log(`Error deleting checkpoint ${checkpointId}: ${(error as Error).message}`);
+      return false;
+    }
+  }
+
+  /**
+   * Clean up old checkpoints for a session, keeping only the most recent
+   *
+   * @param sessionId - The session ID
+   * @returns Number of checkpoints removed
+   */
+  async cleanupOldCheckpoints(sessionId: string): Promise<number> {
+    const checkpoints = await this.listCheckpoints(sessionId);
+
+    if (checkpoints.length <= this.maxCheckpoints) {
+      return 0;
+    }
+
+    // Remove oldest checkpoints (those beyond the limit)
+    const toRemove = checkpoints.slice(this.maxCheckpoints);
+    let removed = 0;
+
+    for (const meta of toRemove) {
+      if (await this.deleteCheckpoint(meta.id)) {
+        removed++;
+      }
+    }
+
+    this.log(`Cleaned up ${removed} old checkpoints for session ${sessionId}`);
+    return removed;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Utility
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Get the checkpoints directory path
+   */
+  getCheckpointsDir(): string {
+    return this.checkpointsDir;
+  }
+
+  /**
+   * Ensure the checkpoints directory exists
+   */
+  ensureCheckpointsDir(): void {
+    if (!existsSync(this.checkpointsDir)) {
+      mkdirSync(this.checkpointsDir, { recursive: true });
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Private: Helper Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Generate a unique checkpoint ID
+   */
+  private generateCheckpointId(sessionId: string, timestamp: string): string {
+    // Format: YYYY-MM-DDTHH-mm-ss-sessionId
+    const safeTimestamp = timestamp.replace(/[:.]/g, '-').substring(0, 19);
+    return `${safeTimestamp}-${sessionId.substring(0, 8)}`;
+  }
+
+  /**
+   * Log a message if logging is enabled
+   */
+  private log(message: string): void {
+    if (this.enableLogging) {
+      console.log(`[CheckpointService] ${message}`);
+    }
+  }
+}
+
+// =============================================================================
+// Factory Function
+// =============================================================================
+
+/**
+ * Create a CheckpointService instance
+ *
+ * @param projectPath - Project root path
+ * @param options - Optional configuration
+ * @returns CheckpointService instance
+ */
+export function createCheckpointService(
+  projectPath: string,
+  options?: Partial<CheckpointServiceOptions>
+): CheckpointService {
+  return new CheckpointService({
+    projectPath,
+    ...options
+  });
+}

ccw/src/core/services/hook-context-service.ts

@@ -0,0 +1,336 @@
+/**
+ * HookContextService - Unified context generation for Claude Code hooks
+ *
+ * Provides centralized context generation for:
+ *   - session-start: MEMORY.md summary + cluster overview + hot entities + patterns
+ *   - per-prompt: vector search + intent matching
+ *   - session-end: task generation for async background processing
+ *
+ * Character limits:
+ *   - session-start: <= 1000 chars
+ *   - per-prompt: <= 500 chars
+ */
+
+import type { SessionEndTask } from '../unified-context-builder.js';
+import { SessionStateService, type SessionState } from './session-state-service.js';
+
+// =============================================================================
+// Constants
+// =============================================================================
+
+/** Maximum character count for session-start context */
+const SESSION_START_LIMIT = 1000;
+
+/** Maximum character count for per-prompt context */
+const PER_PROMPT_LIMIT = 500;
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * Options for building context
+ */
+export interface BuildContextOptions {
+  /** Session ID for state tracking */
+  sessionId: string;
+  /** Project root path */
+  projectId?: string;
+  /** Whether this is the first prompt in the session */
+  isFirstPrompt?: boolean;
+  /** Character limit for the generated context */
+  charLimit?: number;
+  /** Current prompt text (for per-prompt context) */
+  prompt?: string;
+}
+
+/**
+ * Context generation result
+ */
+export interface ContextResult {
+  /** Generated context content */
+  content: string;
+  /** Type of context generated */
+  type: 'session-start' | 'context';
+  /** Whether this was the first prompt */
+  isFirstPrompt: boolean;
+  /** Updated session state */
+  state: SessionState;
+  /** Character count of generated content */
+  charCount: number;
+}
+
+/**
+ * Options for HookContextService
+ */
+export interface HookContextServiceOptions {
+  /** Project root path */
+  projectPath: string;
+  /** Storage type for session state */
+  storageType?: 'global' | 'session-scoped';
+}
+
+// =============================================================================
+// HookContextService
+// =============================================================================
+
+/**
+ * Service for generating hook context
+ *
+ * This service wraps UnifiedContextBuilder and SessionStateService to provide
+ * a unified interface for context generation across CLI hooks and API routes.
+ */
+export class HookContextService {
+  private projectPath: string;
+  private sessionStateService: SessionStateService;
+  private unifiedContextBuilder: InstanceType<typeof import('../unified-context-builder.js').UnifiedContextBuilder> | null = null;
+  private clusteringService: InstanceType<typeof import('../session-clustering-service.js').SessionClusteringService> | null = null;
+  private initialized = false;
+
+  constructor(options: HookContextServiceOptions) {
+    this.projectPath = options.projectPath;
+    this.sessionStateService = new SessionStateService({
+      storageType: options.storageType,
+      projectPath: options.projectPath
+    });
+  }
+
+  /**
+   * Initialize lazy-loaded services
+   */
+  private async initialize(): Promise<void> {
+    if (this.initialized) return;
+
+    try {
+      // Try to load UnifiedContextBuilder (requires embedder)
+      const { isUnifiedEmbedderAvailable } = await import('../unified-vector-index.js');
+      if (isUnifiedEmbedderAvailable()) {
+        const { UnifiedContextBuilder } = await import('../unified-context-builder.js');
+        this.unifiedContextBuilder = new UnifiedContextBuilder(this.projectPath);
+      }
+    } catch {
+      // UnifiedContextBuilder not available
+    }
+
+    try {
+      // Always load SessionClusteringService as fallback
+      const { SessionClusteringService } = await import('../session-clustering-service.js');
+      this.clusteringService = new SessionClusteringService(this.projectPath);
+    } catch {
+      // SessionClusteringService not available
+    }
+
+    this.initialized = true;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Context Generation
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Build context for session-start hook
+   *
+   * @param options - Build context options
+   * @returns Context generation result
+   */
+  async buildSessionStartContext(options: BuildContextOptions): Promise<ContextResult> {
+    await this.initialize();
+
+    const charLimit = options.charLimit ?? SESSION_START_LIMIT;
+
+    // Update session state
+    const { isFirstPrompt, state } = this.sessionStateService.incrementLoad(
+      options.sessionId,
+      options.prompt
+    );
+
+    let content = '';
+
+    // Try UnifiedContextBuilder first
+    if (this.unifiedContextBuilder) {
+      content = await this.unifiedContextBuilder.buildSessionStartContext();
+    } else if (this.clusteringService) {
+      // Fallback to SessionClusteringService
+      content = await this.clusteringService.getProgressiveIndex({
+        type: 'session-start',
+        sessionId: options.sessionId
+      });
+    }
+
+    // Truncate if needed
+    if (content.length > charLimit) {
+      content = content.substring(0, charLimit - 20) + '...';
+    }
+
+    return {
+      content,
+      type: 'session-start',
+      isFirstPrompt,
+      state,
+      charCount: content.length
+    };
+  }
+
+  /**
+   * Build context for per-prompt hook
+   *
+   * @param options - Build context options
+   * @returns Context generation result
+   */
+  async buildPromptContext(options: BuildContextOptions): Promise<ContextResult> {
+    await this.initialize();
+
+    const charLimit = options.charLimit ?? PER_PROMPT_LIMIT;
+
+    // Update session state
+    const { isFirstPrompt, state } = this.sessionStateService.incrementLoad(
+      options.sessionId,
+      options.prompt
+    );
+
+    let content = '';
+    let contextType: 'session-start' | 'context' = 'context';
+
+    // First prompt uses session-start context
+    if (isFirstPrompt) {
+      contextType = 'session-start';
+      if (this.unifiedContextBuilder) {
+        content = await this.unifiedContextBuilder.buildSessionStartContext();
+      } else if (this.clusteringService) {
+        content = await this.clusteringService.getProgressiveIndex({
+          type: 'session-start',
+          sessionId: options.sessionId
+        });
+      }
+    } else if (options.prompt && options.prompt.trim().length > 0) {
+      // Subsequent prompts use per-prompt context
+      contextType = 'context';
+      if (this.unifiedContextBuilder) {
+        content = await this.unifiedContextBuilder.buildPromptContext(options.prompt);
+      } else if (this.clusteringService) {
+        content = await this.clusteringService.getProgressiveIndex({
+          type: 'context',
+          sessionId: options.sessionId,
+          prompt: options.prompt
+        });
+      }
+    }
+
+    // Truncate if needed
+    if (content.length > charLimit) {
+      content = content.substring(0, charLimit - 20) + '...';
+    }
+
+    return {
+      content,
+      type: contextType,
+      isFirstPrompt,
+      state,
+      charCount: content.length
+    };
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Session End Tasks
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Build session end tasks for async background processing
+   *
+   * @param sessionId - Session ID for context
+   * @returns Array of tasks to execute
+   */
+  async buildSessionEndTasks(sessionId: string): Promise<SessionEndTask[]> {
+    await this.initialize();
+
+    if (this.unifiedContextBuilder) {
+      return this.unifiedContextBuilder.buildSessionEndTasks(sessionId);
+    }
+
+    // No tasks available without UnifiedContextBuilder
+    return [];
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Session State Management
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Get session state
+   *
+   * @param sessionId - Session ID
+   * @returns Session state or null if not found
+   */
+  getSessionState(sessionId: string): SessionState | null {
+    return this.sessionStateService.load(sessionId);
+  }
+
+  /**
+   * Check if this is the first prompt for a session
+   *
+   * @param sessionId - Session ID
+   * @returns true if this is the first prompt
+   */
+  isFirstPrompt(sessionId: string): boolean {
+    return this.sessionStateService.isFirstLoad(sessionId);
+  }
+
+  /**
+   * Get load count for a session
+   *
+   * @param sessionId - Session ID
+   * @returns Load count (0 if not found)
+   */
+  getLoadCount(sessionId: string): number {
+    return this.sessionStateService.getLoadCount(sessionId);
+  }
+
+  /**
+   * Clear session state
+   *
+   * @param sessionId - Session ID
+   * @returns true if state was cleared
+   */
+  clearSessionState(sessionId: string): boolean {
+    return this.sessionStateService.clear(sessionId);
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Utility Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check if UnifiedContextBuilder is available
+   *
+   * @returns true if embedder is available
+   */
+  async isAdvancedContextAvailable(): Promise<boolean> {
+    await this.initialize();
+    return this.unifiedContextBuilder !== null;
+  }
+
+  /**
+   * Get the project path
+   */
+  getProjectPath(): string {
+    return this.projectPath;
+  }
+}
+
+// =============================================================================
+// Factory Function
+// =============================================================================
+
+/**
+ * Create a HookContextService instance
+ *
+ * @param projectPath - Project root path
+ * @param storageType - Storage type for session state
+ * @returns HookContextService instance
+ */
+export function createHookContextService(
+  projectPath: string,
+  storageType?: 'global' | 'session-scoped'
+): HookContextService {
+  return new HookContextService({ projectPath, storageType });
+}

ccw/src/core/services/index.ts

@@ -0,0 +1,75 @@
+/**
+ * Core Services Exports
+ *
+ * Central export point for all CCW core services.
+ */
+
+// Session State Management
+export {
+  SessionStateService,
+  loadSessionState,
+  saveSessionState,
+  clearSessionState,
+  updateSessionState,
+  incrementSessionLoad,
+  getSessionStatePath,
+  validateSessionId
+} from './session-state-service.js';
+export type {
+  SessionState,
+  SessionStateOptions,
+  SessionStorageType
+} from './session-state-service.js';
+
+// Hook Context Service
+export { HookContextService } from './hook-context-service.js';
+export type { BuildContextOptions, ContextResult } from './hook-context-service.js';
+
+// Session End Service
+export { SessionEndService } from './session-end-service.js';
+export type { EndTask, TaskResult } from './session-end-service.js';
+
+// Mode Registry Service
+export {
+  ModeRegistryService,
+  MODE_CONFIGS,
+  EXCLUSIVE_MODES,
+  STALE_MARKER_THRESHOLD,
+  createModeRegistryService
+} from './mode-registry-service.js';
+export type {
+  ModeConfig,
+  ModeStatus,
+  ModeRegistryOptions,
+  CanStartResult,
+  ExecutionMode
+} from './mode-registry-service.js';
+
+// Checkpoint Service
+export { CheckpointService, createCheckpointService } from './checkpoint-service.js';
+export type {
+  CheckpointServiceOptions,
+  Checkpoint,
+  CheckpointMeta,
+  CheckpointTrigger,
+  WorkflowStateSnapshot,
+  ModeStateSnapshot,
+  MemoryContextSnapshot
+} from './checkpoint-service.js';
+
+// CLI Session Manager
+export { CliSessionManager } from './cli-session-manager.js';
+export type {
+  CliSession,
+  CreateCliSessionOptions,
+  ExecuteInCliSessionOptions,
+  CliSessionOutputEvent
+} from './cli-session-manager.js';
+
+// Flow Executor
+export { FlowExecutor } from './flow-executor.js';
+export type { ExecutionContext, NodeResult } from './flow-executor.js';
+
+// CLI Launch Registry
+export { getLaunchConfig } from './cli-launch-registry.js';
+export type { CliLaunchConfig, CliTool, LaunchMode } from './cli-launch-registry.js';

ccw/src/core/services/mode-registry-service.ts

@@ -0,0 +1,730 @@
+/**
+ * ModeRegistryService - Centralized Mode State Management
+ *
+ * Provides unified mode state detection and management for CCW.
+ * All modes store state in `.workflow/modes/` directory for consistency.
+ *
+ * Features:
+ *   - Mode activation/deactivation tracking
+ *   - Exclusive mode conflict detection
+ *   - Stale marker cleanup (1 hour threshold)
+ *   - File-based state persistence
+ *
+ * Based on oh-my-claudecode mode-registry pattern.
+ */
+
+import { existsSync, readFileSync, writeFileSync, unlinkSync, mkdirSync, readdirSync, statSync, rmSync } from 'fs';
+import { join, dirname } from 'path';
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * Supported execution modes
+ */
+export type ExecutionMode =
+  | 'autopilot'
+  | 'ralph'
+  | 'ultrawork'
+  | 'swarm'
+  | 'pipeline'
+  | 'team'
+  | 'ultraqa';
+
+/**
+ * Mode configuration
+ */
+export interface ModeConfig {
+  /** Display name for the mode */
+  name: string;
+  /** Primary state file path (relative to .workflow/modes/) */
+  stateFile: string;
+  /** Property to check in JSON state for active status */
+  activeProperty: string;
+  /** Whether this mode is mutually exclusive with other exclusive modes */
+  exclusive?: boolean;
+  /** Description of the mode */
+  description?: string;
+}
+
+/**
+ * Status of a mode
+ */
+export interface ModeStatus {
+  /** The mode identifier */
+  mode: ExecutionMode;
+  /** Whether the mode is currently active */
+  active: boolean;
+  /** Path to the state file */
+  stateFilePath: string;
+  /** Session ID if session-scoped */
+  sessionId?: string;
+}
+
+/**
+ * Result of checking if a mode can be started
+ */
+export interface CanStartResult {
+  /** Whether the mode can be started */
+  allowed: boolean;
+  /** The mode that is blocking (if not allowed) */
+  blockedBy?: ExecutionMode;
+  /** Human-readable message */
+  message?: string;
+}
+
+/**
+ * Options for mode registry operations
+ */
+export interface ModeRegistryOptions {
+  /** Project root path */
+  projectPath: string;
+  /** Enable logging */
+  enableLogging?: boolean;
+}
+
+// =============================================================================
+// Constants
+// =============================================================================
+
+/**
+ * Stale marker threshold (1 hour)
+ * Markers older than this are auto-removed to prevent crashed sessions
+ * from blocking indefinitely.
+ */
+const STALE_MARKER_THRESHOLD = 60 * 60 * 1000; // 1 hour in milliseconds
+
+/**
+ * Mode configuration registry
+ *
+ * Maps each mode to its state file location and detection method.
+ * All paths are relative to .workflow/modes/ directory.
+ */
+const MODE_CONFIGS: Record<ExecutionMode, ModeConfig> = {
+  autopilot: {
+    name: 'Autopilot',
+    stateFile: 'autopilot-state.json',
+    activeProperty: 'active',
+    exclusive: true,
+    description: 'Autonomous execution mode for multi-step tasks'
+  },
+  ralph: {
+    name: 'Ralph',
+    stateFile: 'ralph-state.json',
+    activeProperty: 'active',
+    exclusive: false,
+    description: 'Research and Analysis Learning Pattern Handler'
+  },
+  ultrawork: {
+    name: 'Ultrawork',
+    stateFile: 'ultrawork-state.json',
+    activeProperty: 'active',
+    exclusive: false,
+    description: 'Ultra-focused work mode for deep tasks'
+  },
+  swarm: {
+    name: 'Swarm',
+    stateFile: 'swarm-state.json',
+    activeProperty: 'active',
+    exclusive: true,
+    description: 'Multi-agent swarm execution mode'
+  },
+  pipeline: {
+    name: 'Pipeline',
+    stateFile: 'pipeline-state.json',
+    activeProperty: 'active',
+    exclusive: true,
+    description: 'Pipeline execution mode for sequential tasks'
+  },
+  team: {
+    name: 'Team',
+    stateFile: 'team-state.json',
+    activeProperty: 'active',
+    exclusive: false,
+    description: 'Team collaboration mode'
+  },
+  ultraqa: {
+    name: 'UltraQA',
+    stateFile: 'ultraqa-state.json',
+    activeProperty: 'active',
+    exclusive: false,
+    description: 'Ultra-focused QA mode'
+  }
+};
+
+/**
+ * Modes that are mutually exclusive (cannot run concurrently)
+ */
+const EXCLUSIVE_MODES: ExecutionMode[] = ['autopilot', 'swarm', 'pipeline'];
+
+// Export for external use
+export { MODE_CONFIGS, EXCLUSIVE_MODES, STALE_MARKER_THRESHOLD };
+
+// =============================================================================
+// ModeRegistryService
+// =============================================================================
+
+/**
+ * Service for managing mode state
+ *
+ * This service provides centralized mode state management using file-based
+ * persistence. It supports exclusive mode detection and stale marker cleanup.
+ */
+export class ModeRegistryService {
+  private projectPath: string;
+  private enableLogging: boolean;
+  private modesDir: string;
+
+  constructor(options: ModeRegistryOptions) {
+    this.projectPath = options.projectPath;
+    this.enableLogging = options.enableLogging ?? false;
+    this.modesDir = join(this.projectPath, '.workflow', 'modes');
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Directory Management
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Get the modes directory path
+   */
+  getModesDir(): string {
+    return this.modesDir;
+  }
+
+  /**
+   * Ensure the modes directory exists
+   */
+  ensureModesDir(): void {
+    if (!existsSync(this.modesDir)) {
+      mkdirSync(this.modesDir, { recursive: true });
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Mode State Queries
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check if a specific mode is currently active
+   *
+   * @param mode - The mode to check
+   * @param sessionId - Optional session ID to check session-scoped state
+   * @returns true if the mode is active
+   */
+  isModeActive(mode: ExecutionMode, sessionId?: string): boolean {
+    const config = MODE_CONFIGS[mode];
+
+    if (sessionId) {
+      // Check session-scoped path
+      const sessionStateFile = this.getSessionStatePath(mode, sessionId);
+      return this.isJsonModeActive(sessionStateFile, config, sessionId);
+    }
+
+    // Check legacy shared path
+    const stateFile = this.getStateFilePath(mode);
+    return this.isJsonModeActive(stateFile, config);
+  }
+
+  /**
+   * Check if a mode has state (file exists)
+   *
+   * @param mode - The mode to check
+   * @param sessionId - Optional session ID
+   * @returns true if state file exists
+   */
+  hasModeState(mode: ExecutionMode, sessionId?: string): boolean {
+    const stateFile = sessionId
+      ? this.getSessionStatePath(mode, sessionId)
+      : this.getStateFilePath(mode);
+    return existsSync(stateFile);
+  }
+
+  /**
+   * Get all active modes
+   *
+   * @param sessionId - Optional session ID to check session-scoped state
+   * @returns Array of active mode identifiers
+   */
+  getActiveModes(sessionId?: string): ExecutionMode[] {
+    const modes: ExecutionMode[] = [];
+
+    for (const mode of Object.keys(MODE_CONFIGS) as ExecutionMode[]) {
+      if (this.isModeActive(mode, sessionId)) {
+        modes.push(mode);
+      }
+    }
+
+    return modes;
+  }
+
+  /**
+   * Check if any mode is currently active
+   *
+   * @param sessionId - Optional session ID
+   * @returns true if any mode is active
+   */
+  isAnyModeActive(sessionId?: string): boolean {
+    return this.getActiveModes(sessionId).length > 0;
+  }
+
+  /**
+   * Get the currently active exclusive mode (if any)
+   *
+   * @returns The active exclusive mode or null
+   */
+  getActiveExclusiveMode(): ExecutionMode | null {
+    for (const mode of EXCLUSIVE_MODES) {
+      if (this.isModeActiveInAnySession(mode)) {
+        return mode;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Get status of all modes
+   *
+   * @param sessionId - Optional session ID
+   * @returns Array of mode statuses
+   */
+  getAllModeStatuses(sessionId?: string): ModeStatus[] {
+    return (Object.keys(MODE_CONFIGS) as ExecutionMode[]).map(mode => ({
+      mode,
+      active: this.isModeActive(mode, sessionId),
+      stateFilePath: sessionId
+        ? this.getSessionStatePath(mode, sessionId)
+        : this.getStateFilePath(mode),
+      sessionId
+    }));
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Mode Control
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check if a new mode can be started
+   *
+   * @param mode - The mode to start
+   * @param sessionId - Optional session ID
+   * @returns CanStartResult with allowed status and blocker info
+   */
+  canStartMode(mode: ExecutionMode, sessionId?: string): CanStartResult {
+    const config = MODE_CONFIGS[mode];
+
+    // Check for mutually exclusive modes
+    if (EXCLUSIVE_MODES.includes(mode)) {
+      for (const exclusiveMode of EXCLUSIVE_MODES) {
+        if (exclusiveMode !== mode && this.isModeActiveInAnySession(exclusiveMode)) {
+          const exclusiveConfig = MODE_CONFIGS[exclusiveMode];
+          return {
+            allowed: false,
+            blockedBy: exclusiveMode,
+            message: `Cannot start ${config.name} while ${exclusiveConfig.name} is active. Cancel ${exclusiveConfig.name} first.`
+          };
+        }
+      }
+    }
+
+    // Check if already active in this session
+    if (sessionId && this.isModeActive(mode, sessionId)) {
+      return {
+        allowed: false,
+        blockedBy: mode,
+        message: `${config.name} is already active in this session.`
+      };
+    }
+
+    return { allowed: true };
+  }
+
+  /**
+   * Activate a mode
+   *
+   * @param mode - The mode to activate
+   * @param sessionId - Session ID
+   * @param context - Optional context to store with state
+   * @returns true if activation was successful
+   */
+  activateMode(mode: ExecutionMode, sessionId: string, context?: Record<string, unknown>): boolean {
+    const config = MODE_CONFIGS[mode];
+
+    // Check if can start
+    const canStart = this.canStartMode(mode, sessionId);
+    if (!canStart.allowed) {
+      this.log(`Cannot activate ${config.name}: ${canStart.message}`);
+      return false;
+    }
+
+    try {
+      this.ensureModesDir();
+
+      const stateFile = this.getSessionStatePath(mode, sessionId);
+      const stateDir = dirname(stateFile);
+      if (!existsSync(stateDir)) {
+        mkdirSync(stateDir, { recursive: true });
+      }
+
+      const state = {
+        [config.activeProperty]: true,
+        session_id: sessionId,
+        activatedAt: new Date().toISOString(),
+        ...context
+      };
+
+      writeFileSync(stateFile, JSON.stringify(state, null, 2), 'utf-8');
+      this.log(`Activated ${config.name} for session ${sessionId}`);
+      return true;
+    } catch (error) {
+      this.log(`Failed to activate ${config.name}: ${(error as Error).message}`);
+      return false;
+    }
+  }
+
+  /**
+   * Deactivate a mode
+   *
+   * @param mode - The mode to deactivate
+   * @param sessionId - Session ID
+   * @returns true if deactivation was successful
+   */
+  deactivateMode(mode: ExecutionMode, sessionId: string): boolean {
+    const config = MODE_CONFIGS[mode];
+
+    try {
+      const stateFile = this.getSessionStatePath(mode, sessionId);
+
+      if (!existsSync(stateFile)) {
+        return true; // Already inactive
+      }
+
+      unlinkSync(stateFile);
+      this.log(`Deactivated ${config.name} for session ${sessionId}`);
+      return true;
+    } catch (error) {
+      this.log(`Failed to deactivate ${config.name}: ${(error as Error).message}`);
+      return false;
+    }
+  }
+
+  /**
+   * Clear all state for a mode
+   *
+   * @param mode - The mode to clear
+   * @param sessionId - Optional session ID (if provided, only clears session state)
+   * @returns true if successful
+   */
+  clearModeState(mode: ExecutionMode, sessionId?: string): boolean {
+    let success = true;
+
+    if (sessionId) {
+      // Clear session-scoped state only
+      const sessionStateFile = this.getSessionStatePath(mode, sessionId);
+      if (existsSync(sessionStateFile)) {
+        try {
+          unlinkSync(sessionStateFile);
+        } catch {
+          success = false;
+        }
+      }
+      return success;
+    }
+
+    // Clear all state for this mode
+    const stateFile = this.getStateFilePath(mode);
+    if (existsSync(stateFile)) {
+      try {
+        unlinkSync(stateFile);
+      } catch {
+        success = false;
+      }
+    }
+
+    // Also clear session-scoped states
+    try {
+      const sessionIds = this.listSessionIds();
+      for (const sid of sessionIds) {
+        const sessionFile = this.getSessionStatePath(mode, sid);
+        if (existsSync(sessionFile)) {
+          try {
+            unlinkSync(sessionFile);
+          } catch {
+            success = false;
+          }
+        }
+      }
+    } catch {
+      // Ignore errors scanning sessions
+    }
+
+    return success;
+  }
+
+  /**
+   * Clear all mode states (force clear)
+   *
+   * @returns true if all states were cleared
+   */
+  clearAllModeStates(): boolean {
+    let success = true;
+
+    for (const mode of Object.keys(MODE_CONFIGS) as ExecutionMode[]) {
+      if (!this.clearModeState(mode)) {
+        success = false;
+      }
+    }
+
+    return success;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Session Management
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Check if a mode is active in any session
+   *
+   * @param mode - The mode to check
+   * @returns true if the mode is active in any session
+   */
+  isModeActiveInAnySession(mode: ExecutionMode): boolean {
+    // Check legacy path first
+    if (this.isModeActive(mode)) {
+      return true;
+    }
+
+    // Scan all session dirs
+    const sessionIds = this.listSessionIds();
+    for (const sid of sessionIds) {
+      if (this.isModeActive(mode, sid)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  /**
+   * Get all session IDs that have a specific mode active
+   *
+   * @param mode - The mode to check
+   * @returns Array of session IDs with this mode active
+   */
+  getActiveSessionsForMode(mode: ExecutionMode): string[] {
+    const sessionIds = this.listSessionIds();
+    return sessionIds.filter(sid => this.isModeActive(mode, sid));
+  }
+
+  /**
+   * List all session IDs that have mode state files
+   *
+   * @returns Array of session IDs
+   */
+  listSessionIds(): string[] {
+    const sessionsDir = join(this.modesDir, 'sessions');
+    if (!existsSync(sessionsDir)) {
+      return [];
+    }
+
+    try {
+      return readdirSync(sessionsDir, { withFileTypes: true })
+        .filter(dirent => dirent.isDirectory())
+        .map(dirent => dirent.name)
+        .filter(name => this.isValidSessionId(name));
+    } catch {
+      return [];
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Stale State Cleanup
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Clear stale session directories
+   *
+   * Removes session directories that have no recent activity.
+   *
+   * @param maxAgeMs - Maximum age in milliseconds (default: 24 hours)
+   * @returns Array of removed session IDs
+   */
+  clearStaleSessionDirs(maxAgeMs: number = 24 * 60 * 60 * 1000): string[] {
+    const sessionsDir = join(this.modesDir, 'sessions');
+    if (!existsSync(sessionsDir)) {
+      return [];
+    }
+
+    const removed: string[] = [];
+    const sessionIds = this.listSessionIds();
+
+    for (const sid of sessionIds) {
+      const sessionDir = this.getSessionDir(sid);
+      try {
+        const files = readdirSync(sessionDir);
+
+        // Remove empty directories
+        if (files.length === 0) {
+          rmSync(sessionDir, { recursive: true, force: true });
+          removed.push(sid);
+          continue;
+        }
+
+        // Check modification time of any state file
+        let newest = 0;
+        for (const f of files) {
+          const stat = statSync(join(sessionDir, f));
+          if (stat.mtimeMs > newest) {
+            newest = stat.mtimeMs;
+          }
+        }
+
+        // Remove if stale
+        if (Date.now() - newest > maxAgeMs) {
+          rmSync(sessionDir, { recursive: true, force: true });
+          removed.push(sid);
+        }
+      } catch {
+        // Skip on error
+      }
+    }
+
+    return removed;
+  }
+
+  /**
+   * Clean up stale markers (older than threshold)
+   *
+   * @returns Array of cleaned up session IDs
+   */
+  cleanupStaleMarkers(): string[] {
+    const cleaned: string[] = [];
+    const sessionIds = this.listSessionIds();
+
+    for (const sid of sessionIds) {
+      for (const mode of Object.keys(MODE_CONFIGS) as ExecutionMode[]) {
+        const stateFile = this.getSessionStatePath(mode, sid);
+        if (existsSync(stateFile)) {
+          try {
+            const content = readFileSync(stateFile, 'utf-8');
+            const state = JSON.parse(content);
+
+            if (state.activatedAt) {
+              const activatedAt = new Date(state.activatedAt).getTime();
+              const age = Date.now() - activatedAt;
+
+              if (age > STALE_MARKER_THRESHOLD) {
+                this.log(`Cleaning up stale ${mode} marker for session ${sid} (${Math.round(age / 60000)} min old)`);
+                unlinkSync(stateFile);
+                cleaned.push(sid);
+              }
+            }
+          } catch {
+            // Skip invalid files
+          }
+        }
+      }
+    }
+
+    return Array.from(new Set(cleaned)); // Remove duplicates
+  }
+
+  // ---------------------------------------------------------------------------
+  // Private: Utility Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Get the state file path for a mode (legacy shared path)
+   */
+  private getStateFilePath(mode: ExecutionMode): string {
+    const config = MODE_CONFIGS[mode];
+    return join(this.modesDir, config.stateFile);
+  }
+
+  /**
+   * Get the session-scoped state file path
+   */
+  private getSessionStatePath(mode: ExecutionMode, sessionId: string): string {
+    const config = MODE_CONFIGS[mode];
+    return join(this.modesDir, 'sessions', sessionId, config.stateFile);
+  }
+
+  /**
+   * Get the session directory path
+   */
+  private getSessionDir(sessionId: string): string {
+    return join(this.modesDir, 'sessions', sessionId);
+  }
+
+  /**
+   * Check if a JSON-based mode is active
+   */
+  private isJsonModeActive(
+    stateFile: string,
+    config: ModeConfig,
+    sessionId?: string
+  ): boolean {
+    if (!existsSync(stateFile)) {
+      return false;
+    }
+
+    try {
+      const content = readFileSync(stateFile, 'utf-8');
+      const state = JSON.parse(content);
+
+      // Validate session identity if sessionId provided
+      if (sessionId && state.session_id && state.session_id !== sessionId) {
+        return false;
+      }
+
+      if (config.activeProperty) {
+        return state[config.activeProperty] === true;
+      }
+
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  /**
+   * Validate session ID format
+   */
+  private isValidSessionId(sessionId: string): boolean {
+    if (!sessionId || typeof sessionId !== 'string') {
+      return false;
+    }
+    // Allow alphanumeric, hyphens, and underscores only
+    const SAFE_SESSION_ID_PATTERN = /^[a-zA-Z0-9][a-zA-Z0-9_-]{0,255}$/;
+    return SAFE_SESSION_ID_PATTERN.test(sessionId);
+  }
+
+  /**
+   * Log a message if logging is enabled
+   */
+  private log(message: string): void {
+    if (this.enableLogging) {
+      const timestamp = new Date().toISOString();
+      console.log(`[ModeRegistry ${timestamp}] ${message}`);
+    }
+  }
+}
+
+// =============================================================================
+// Factory Function
+// =============================================================================
+
+/**
+ * Create a ModeRegistryService instance
+ *
+ * @param projectPath - Project root path
+ * @param enableLogging - Enable logging
+ * @returns ModeRegistryService instance
+ */
+export function createModeRegistryService(
+  projectPath: string,
+  enableLogging?: boolean
+): ModeRegistryService {
+  return new ModeRegistryService({ projectPath, enableLogging });
+}

ccw/src/core/services/session-end-service.ts

@@ -0,0 +1,408 @@
+/**
+ * SessionEndService - Unified session end handling
+ *
+ * Provides centralized management for session-end tasks:
+ *   - Task registration with priority
+ *   - Async execution with error handling
+ *   - Built-in tasks: incremental-embedding, clustering, heat-scores
+ *
+ * Design:
+ *   - Best-effort execution (failures logged but don't block)
+ *   - Priority-based ordering
+ *   - Support for async background execution
+ */
+
+// =============================================================================
+// Types
+// =============================================================================
+
+/**
+ * A task to be executed at session end
+ */
+export interface EndTask {
+  /** Unique task type identifier */
+  type: string;
+  /** Task priority (higher = executed first) */
+  priority: number;
+  /** Whether to run asynchronously in background */
+  async: boolean;
+  /** Task handler function */
+  handler: () => Promise<void>;
+  /** Optional description */
+  description?: string;
+}
+
+/**
+ * Result of a task execution
+ */
+export interface TaskResult {
+  /** Task type identifier */
+  type: string;
+  /** Whether the task succeeded */
+  success: boolean;
+  /** Execution duration in milliseconds */
+  duration: number;
+  /** Error message if failed */
+  error?: string;
+}
+
+/**
+ * Options for SessionEndService
+ */
+export interface SessionEndServiceOptions {
+  /** Project root path */
+  projectPath: string;
+  /** Whether to log task execution */
+  enableLogging?: boolean;
+}
+
+/**
+ * Summary of session end execution
+ */
+export interface SessionEndSummary {
+  /** Total tasks executed */
+  totalTasks: number;
+  /** Number of successful tasks */
+  successful: number;
+  /** Number of failed tasks */
+  failed: number;
+  /** Total execution time in milliseconds */
+  totalDuration: number;
+  /** Individual task results */
+  results: TaskResult[];
+}
+
+// =============================================================================
+// Built-in Task Types
+// =============================================================================
+
+/** Task type for incremental vector embedding */
+export const TASK_INCREMENTAL_EMBEDDING = 'incremental-embedding';
+
+/** Task type for incremental clustering */
+export const TASK_INCREMENTAL_CLUSTERING = 'incremental-clustering';
+
+/** Task type for heat score updates */
+export const TASK_HEAT_SCORE_UPDATE = 'heat-score-update';
+
+// =============================================================================
+// SessionEndService
+// =============================================================================
+
+/**
+ * Service for managing and executing session-end tasks
+ *
+ * This service provides a unified interface for registering and executing
+ * background tasks when a session ends. Tasks are executed best-effort
+ * with proper error handling and logging.
+ */
+export class SessionEndService {
+  private projectPath: string;
+  private enableLogging: boolean;
+  private tasks: Map<string, EndTask> = new Map();
+
+  constructor(options: SessionEndServiceOptions) {
+    this.projectPath = options.projectPath;
+    this.enableLogging = options.enableLogging ?? false;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Task Registration
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Register a session-end task
+   *
+   * @param task - Task to register
+   * @returns true if task was registered (false if type already exists)
+   */
+  registerEndTask(task: EndTask): boolean {
+    if (this.tasks.has(task.type)) {
+      this.log(`Task "${task.type}" already registered, skipping`);
+      return false;
+    }
+
+    this.tasks.set(task.type, task);
+    this.log(`Registered task "${task.type}" with priority ${task.priority}`);
+    return true;
+  }
+
+  /**
+   * Unregister a session-end task
+   *
+   * @param type - Task type to unregister
+   * @returns true if task was removed
+   */
+  unregisterEndTask(type: string): boolean {
+    const removed = this.tasks.delete(type);
+    if (removed) {
+      this.log(`Unregistered task "${type}"`);
+    }
+    return removed;
+  }
+
+  /**
+   * Check if a task type is registered
+   *
+   * @param type - Task type to check
+   * @returns true if task is registered
+   */
+  hasTask(type: string): boolean {
+    return this.tasks.has(type);
+  }
+
+  /**
+   * Get all registered task types
+   *
+   * @returns Array of task types
+   */
+  getRegisteredTasks(): string[] {
+    return Array.from(this.tasks.keys());
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Task Execution
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Execute all registered session-end tasks
+   *
+   * Tasks are executed in priority order (highest first).
+   * Failures are logged but don't prevent other tasks from running.
+   *
+   * @param sessionId - Session ID for context
+   * @returns Summary of execution results
+   */
+  async executeEndTasks(sessionId: string): Promise<SessionEndSummary> {
+    const startTime = Date.now();
+    const results: TaskResult[] = [];
+
+    // Sort tasks by priority (descending)
+    const sortedTasks = Array.from(this.tasks.values()).sort(
+      (a, b) => b.priority - a.priority
+    );
+
+    this.log(`Executing ${sortedTasks.length} session-end tasks for session ${sessionId}`);
+
+    // Execute tasks concurrently
+    const executionPromises = sortedTasks.map(async (task) => {
+      const taskStart = Date.now();
+
+      try {
+        this.log(`Starting task "${task.type}"...`);
+        await task.handler();
+
+        const duration = Date.now() - taskStart;
+        this.log(`Task "${task.type}" completed in ${duration}ms`);
+
+        return {
+          type: task.type,
+          success: true,
+          duration
+        } as TaskResult;
+      } catch (err) {
+        const duration = Date.now() - taskStart;
+        const errorMessage = (err as Error).message || 'Unknown error';
+        this.log(`Task "${task.type}" failed: ${errorMessage}`);
+
+        return {
+          type: task.type,
+          success: false,
+          duration,
+          error: errorMessage
+        } as TaskResult;
+      }
+    });
+
+    // Wait for all tasks to complete
+    const taskResults = await Promise.allSettled(executionPromises);
+
+    // Collect results
+    for (const result of taskResults) {
+      if (result.status === 'fulfilled') {
+        results.push(result.value);
+      } else {
+        // This shouldn't happen as we catch errors inside the task
+        results.push({
+          type: 'unknown',
+          success: false,
+          duration: 0,
+          error: result.reason?.message || 'Task promise rejected'
+        });
+      }
+    }
+
+    const totalDuration = Date.now() - startTime;
+    const successful = results.filter((r) => r.success).length;
+    const failed = results.length - successful;
+
+    this.log(
+      `Session-end tasks completed: ${successful}/${results.length} successful, ` +
+        `${totalDuration}ms total`
+    );
+
+    return {
+      totalTasks: results.length,
+      successful,
+      failed,
+      totalDuration,
+      results
+    };
+  }
+
+  /**
+   * Execute only async (background) tasks
+   *
+   * This is useful for fire-and-forget background processing.
+   *
+   * @param sessionId - Session ID for context
+   * @returns Promise that resolves immediately (tasks run in background)
+   */
+  executeBackgroundTasks(sessionId: string): void {
+    const asyncTasks = Array.from(this.tasks.values())
+      .filter((t) => t.async)
+      .sort((a, b) => b.priority - a.priority);
+
+    if (asyncTasks.length === 0) {
+      return;
+    }
+
+    // Fire-and-forget
+    Promise.all(
+      asyncTasks.map(async (task) => {
+        try {
+          this.log(`Background task "${task.type}" starting...`);
+          await task.handler();
+          this.log(`Background task "${task.type}" completed`);
+        } catch (err) {
+          this.log(`Background task "${task.type}" failed: ${(err as Error).message}`);
+        }
+      })
+    ).catch(() => {
+      // Ignore errors - background tasks are best-effort
+    });
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public: Built-in Tasks
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Register built-in session-end tasks
+   *
+   * This registers the standard tasks:
+   *   - incremental-embedding (priority 100)
+   *   - incremental-clustering (priority 50)
+   *   - heat-score-update (priority 25)
+   *
+   * @param sessionId - Session ID for context
+   */
+  async registerBuiltinTasks(sessionId: string): Promise<void> {
+    // Try to import and register embedding task
+    try {
+      const { isUnifiedEmbedderAvailable, UnifiedVectorIndex } = await import(
+        '../unified-vector-index.js'
+      );
+      const { getMemoryMdContent } = await import('../memory-consolidation-pipeline.js');
+
+      if (isUnifiedEmbedderAvailable()) {
+        this.registerEndTask({
+          type: TASK_INCREMENTAL_EMBEDDING,
+          priority: 100,
+          async: true,
+          description: 'Index new/updated content in vector store',
+          handler: async () => {
+            const vectorIndex = new UnifiedVectorIndex(this.projectPath);
+            const memoryContent = getMemoryMdContent(this.projectPath);
+            if (memoryContent) {
+              await vectorIndex.indexContent(memoryContent, {
+                source_id: 'MEMORY_MD',
+                source_type: 'core_memory',
+                category: 'core_memory'
+              });
+            }
+          }
+        });
+      }
+    } catch {
+      // Embedding dependencies not available
+      this.log('Embedding task not registered: dependencies not available');
+    }
+
+    // Try to import and register clustering task
+    try {
+      const { SessionClusteringService } = await import('../session-clustering-service.js');
+
+      this.registerEndTask({
+        type: TASK_INCREMENTAL_CLUSTERING,
+        priority: 50,
+        async: true,
+        description: 'Cluster unclustered sessions',
+        handler: async () => {
+          const clusteringService = new SessionClusteringService(this.projectPath);
+          await clusteringService.autocluster({ scope: 'unclustered' });
+        }
+      });
+    } catch {
+      this.log('Clustering task not registered: dependencies not available');
+    }
+
+    // Try to import and register heat score task
+    try {
+      const { getMemoryStore } = await import('../memory-store.js');
+
+      this.registerEndTask({
+        type: TASK_HEAT_SCORE_UPDATE,
+        priority: 25,
+        async: true,
+        description: 'Update entity heat scores',
+        handler: async () => {
+          const memoryStore = getMemoryStore(this.projectPath);
+          const hotEntities = memoryStore.getHotEntities(50);
+          for (const entity of hotEntities) {
+            if (entity.id != null) {
+              memoryStore.calculateHeatScore(entity.id);
+            }
+          }
+        }
+      });
+    } catch {
+      this.log('Heat score task not registered: dependencies not available');
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Private: Utility Methods
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Log a message if logging is enabled
+   */
+  private log(message: string): void {
+    if (this.enableLogging) {
+      console.log(`[SessionEndService] ${message}`);
+    }
+  }
+}
+
+// =============================================================================
+// Factory Function
+// =============================================================================
+
+/**
+ * Create a SessionEndService instance with built-in tasks
+ *
+ * @param projectPath - Project root path
+ * @param sessionId - Session ID for context
+ * @param enableLogging - Whether to enable logging
+ * @returns SessionEndService instance with built-in tasks registered
+ */
+export async function createSessionEndService(
+  projectPath: string,
+  sessionId: string,
+  enableLogging = false
+): Promise<SessionEndService> {
+  const service = new SessionEndService({ projectPath, enableLogging });
+  await service.registerBuiltinTasks(sessionId);
+  return service;
+}

ccw/src/core/services/session-state-service.ts

@@ -0,0 +1,330 @@
+/**
+ * SessionStateService - Unified session state management
+ *
+ * Provides centralized session state persistence across CLI hooks and API routes.
+ * Supports both legacy global path (~/.claude/.ccw-sessions/) and session-scoped
+ * paths (.workflow/sessions/{sessionId}/) for workflow integration.
+ */
+
+import { existsSync, readFileSync, writeFileSync, mkdirSync, unlinkSync, rmSync } from 'fs';
+import { join, dirname } from 'path';
+import { homedir } from 'os';
+
+/**
+ * Session state interface
+ */
+export interface SessionState {
+  /** ISO timestamp of first session load */
+  firstLoad: string;
+  /** Number of times session has been loaded */
+  loadCount: number;
+  /** Last prompt text (optional) */
+  lastPrompt?: string;
+  /** Active mode for the session (optional) */
+  activeMode?: 'analysis' | 'write' | 'review' | 'auto';
+}
+
+/**
+ * Storage type for session state
+ */
+export type SessionStorageType = 'global' | 'session-scoped';
+
+/**
+ * Options for session state operations
+ */
+export interface SessionStateOptions {
+  /** Storage type: 'global' uses ~/.claude/.ccw-sessions/, 'session-scoped' uses .workflow/sessions/{sessionId}/ */
+  storageType?: SessionStorageType;
+  /** Project root path (required for session-scoped storage) */
+  projectPath?: string;
+}
+
+/**
+ * Validates that a session ID is safe to use in file paths.
+ * Session IDs should be alphanumeric with optional hyphens and underscores.
+ * This prevents path traversal attacks (e.g., "../../../etc").
+ *
+ * @param sessionId - The session ID to validate
+ * @returns true if the session ID is safe, false otherwise
+ */
+export function validateSessionId(sessionId: string): boolean {
+  if (!sessionId || typeof sessionId !== 'string') {
+    return false;
+  }
+  // Allow alphanumeric, hyphens, and underscores only
+  // Must be 1-256 characters (reasonable length limit)
+  // Must not start with a dot (hidden files) or hyphen
+  const SAFE_SESSION_ID_PATTERN = /^[a-zA-Z0-9][a-zA-Z0-9_-]{0,255}$/;
+  return SAFE_SESSION_ID_PATTERN.test(sessionId);
+}
+
+/**
+ * Get the default global session state directory
+ * Uses ~/.claude/.ccw-sessions/ for reliable persistence across sessions
+ */
+function getGlobalStateDir(): string {
+  return join(homedir(), '.claude', '.ccw-sessions');
+}
+
+/**
+ * Get session state file path
+ *
+ * Supports two storage modes:
+ * - 'global': ~/.claude/.ccw-sessions/session-{sessionId}.json (default)
+ * - 'session-scoped': {projectPath}/.workflow/sessions/{sessionId}/state.json
+ *
+ * @param sessionId - The session ID
+ * @param options - Storage options
+ * @returns Full path to the session state file
+ */
+export function getSessionStatePath(sessionId: string, options?: SessionStateOptions): string {
+  if (!validateSessionId(sessionId)) {
+    throw new Error(`Invalid session ID: ${sessionId}`);
+  }
+
+  const storageType = options?.storageType ?? 'global';
+
+  if (storageType === 'session-scoped') {
+    if (!options?.projectPath) {
+      throw new Error('projectPath is required for session-scoped storage');
+    }
+    const stateDir = join(options.projectPath, '.workflow', 'sessions', sessionId);
+    if (!existsSync(stateDir)) {
+      mkdirSync(stateDir, { recursive: true });
+    }
+    return join(stateDir, 'state.json');
+  }
+
+  // Global storage (default)
+  const stateDir = getGlobalStateDir();
+  if (!existsSync(stateDir)) {
+    mkdirSync(stateDir, { recursive: true });
+  }
+  return join(stateDir, `session-${sessionId}.json`);
+}
+
+/**
+ * Load session state from file
+ *
+ * @param sessionId - The session ID
+ * @param options - Storage options
+ * @returns SessionState if exists and valid, null otherwise
+ */
+export function loadSessionState(sessionId: string, options?: SessionStateOptions): SessionState | null {
+  if (!validateSessionId(sessionId)) {
+    return null;
+  }
+
+  try {
+    const stateFile = getSessionStatePath(sessionId, options);
+    if (!existsSync(stateFile)) {
+      return null;
+    }
+
+    const content = readFileSync(stateFile, 'utf-8');
+    const parsed = JSON.parse(content) as SessionState;
+
+    // Validate required fields
+    if (typeof parsed.firstLoad !== 'string' || typeof parsed.loadCount !== 'number') {
+      return null;
+    }
+
+    return parsed;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Save session state to file
+ *
+ * @param sessionId - The session ID
+ * @param state - The session state to save
+ * @param options - Storage options
+ */
+export function saveSessionState(sessionId: string, state: SessionState, options?: SessionStateOptions): void {
+  if (!validateSessionId(sessionId)) {
+    throw new Error(`Invalid session ID: ${sessionId}`);
+  }
+
+  const stateFile = getSessionStatePath(sessionId, options);
+
+  // Ensure parent directory exists
+  const stateDir = dirname(stateFile);
+  if (!existsSync(stateDir)) {
+    mkdirSync(stateDir, { recursive: true });
+  }
+
+  writeFileSync(stateFile, JSON.stringify(state, null, 2), 'utf-8');
+}
+
+/**
+ * Clear session state (for session-end cleanup)
+ *
+ * @param sessionId - The session ID
+ * @param options - Storage options
+ * @returns true if state was cleared, false if it didn't exist
+ */
+export function clearSessionState(sessionId: string, options?: SessionStateOptions): boolean {
+  if (!validateSessionId(sessionId)) {
+    return false;
+  }
+
+  try {
+    const stateFile = getSessionStatePath(sessionId, options);
+
+    if (!existsSync(stateFile)) {
+      return false;
+    }
+
+    unlinkSync(stateFile);
+
+    // For session-scoped storage, also remove the session directory if empty
+    if (options?.storageType === 'session-scoped' && options.projectPath) {
+      const sessionDir = join(options.projectPath, '.workflow', 'sessions', sessionId);
+      try {
+        // Try to remove the directory (will fail if not empty)
+        rmSync(sessionDir, { recursive: false, force: true });
+      } catch {
+        // Directory not empty or other error - ignore
+      }
+    }
+
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Update session state with new values
+ *
+ * This is a convenience function that loads existing state, merges with updates,
+ * and saves the result.
+ *
+ * @param sessionId - The session ID
+ * @param updates - Partial state to merge
+ * @param options - Storage options
+ * @returns The updated state
+ */
+export function updateSessionState(
+  sessionId: string,
+  updates: Partial<SessionState>,
+  options?: SessionStateOptions
+): SessionState {
+  const existing = loadSessionState(sessionId, options);
+
+  const newState: SessionState = existing
+    ? { ...existing, ...updates }
+    : {
+        firstLoad: new Date().toISOString(),
+        loadCount: 1,
+        ...updates
+      };
+
+  saveSessionState(sessionId, newState, options);
+  return newState;
+}
+
+/**
+ * Increment the load count for a session
+ *
+ * This is a convenience function for the common pattern of tracking
+ * how many times a session has been loaded.
+ *
+ * @param sessionId - The session ID
+ * @param prompt - Optional prompt to record as lastPrompt
+ * @param options - Storage options
+ * @returns Object with isFirstPrompt flag and updated state
+ */
+export function incrementSessionLoad(
+  sessionId: string,
+  prompt?: string,
+  options?: SessionStateOptions
+): { isFirstPrompt: boolean; state: SessionState } {
+  const existing = loadSessionState(sessionId, options);
+  const isFirstPrompt = !existing;
+
+  const state: SessionState = isFirstPrompt
+    ? {
+        firstLoad: new Date().toISOString(),
+        loadCount: 1,
+        lastPrompt: prompt
+      }
+    : {
+        ...existing,
+        loadCount: existing.loadCount + 1,
+        ...(prompt !== undefined && { lastPrompt: prompt })
+      };
+
+  saveSessionState(sessionId, state, options);
+  return { isFirstPrompt, state };
+}
+
+/**
+ * SessionStateService class for object-oriented usage
+ */
+export class SessionStateService {
+  private options?: SessionStateOptions;
+
+  constructor(options?: SessionStateOptions) {
+    this.options = options;
+  }
+
+  /**
+   * Get session state file path
+   */
+  getStatePath(sessionId: string): string {
+    return getSessionStatePath(sessionId, this.options);
+  }
+
+  /**
+   * Load session state
+   */
+  load(sessionId: string): SessionState | null {
+    return loadSessionState(sessionId, this.options);
+  }
+
+  /**
+   * Save session state
+   */
+  save(sessionId: string, state: SessionState): void {
+    saveSessionState(sessionId, state, this.options);
+  }
+
+  /**
+   * Clear session state
+   */
+  clear(sessionId: string): boolean {
+    return clearSessionState(sessionId, this.options);
+  }
+
+  /**
+   * Update session state
+   */
+  update(sessionId: string, updates: Partial<SessionState>): SessionState {
+    return updateSessionState(sessionId, updates, this.options);
+  }
+
+  /**
+   * Increment load count
+   */
+  incrementLoad(sessionId: string, prompt?: string): { isFirstPrompt: boolean; state: SessionState } {
+    return incrementSessionLoad(sessionId, prompt, this.options);
+  }
+
+  /**
+   * Check if session is first load
+   */
+  isFirstLoad(sessionId: string): boolean {
+    return this.load(sessionId) === null;
+  }
+
+  /**
+   * Get load count for session
+   */
+  getLoadCount(sessionId: string): number {
+    const state = this.load(sessionId);
+    return state?.loadCount ?? 0;
+  }
+}

ccw/src/templates/hooks-config-example.json

@@ -5,11 +5,15 @@
     "session-start": [
       {
         "name": "Progressive Disclosure",
-        "description": "Injects progressive disclosure index at session start",
+        "description": "Injects progressive disclosure index at session start with recovery detection",
         "enabled": true,
         "handler": "internal:context",
         "timeout": 5000,
-        "failMode": "silent"
+        "failMode": "silent",
+        "notes": [
+          "Checks for recovery checkpoints and injects recovery message if found",
+          "Uses RecoveryHandler.checkRecovery() for session recovery"
+        ]
       }
     ],
     "session-end": [
@@ -21,6 +25,61 @@
         "timeout": 30000,
         "async": true,
         "failMode": "log"
+      },
+      {
+        "name": "Mode State Cleanup",
+        "description": "Deactivates all active modes for the session",
+        "enabled": true,
+        "command": "ccw hook session-end --stdin",
+        "timeout": 5000,
+        "failMode": "silent"
+      }
+    ],
+    "Stop": [
+      {
+        "name": "Stop Handler",
+        "description": "Handles Stop hook events with Soft Enforcement - injects continuation messages for active workflows/modes",
+        "enabled": true,
+        "command": "ccw hook stop --stdin",
+        "timeout": 5000,
+        "failMode": "silent",
+        "notes": [
+          "Priority order: context-limit > user-abort > active-workflow > active-mode",
+          "ALWAYS returns continue: true (never blocks stops)",
+          "Injects continuation message instead of blocking",
+          "Deadlock prevention: context-limit stops are always allowed",
+          "Uses ModeRegistryService to check active modes"
+        ]
+      }
+    ],
+    "PreCompact": [
+      {
+        "name": "Checkpoint Creation",
+        "description": "Creates checkpoint before context compaction to preserve session state",
+        "enabled": true,
+        "command": "ccw hook pre-compact --stdin",
+        "timeout": 10000,
+        "failMode": "silent",
+        "notes": [
+          "Creates checkpoint with mode states, workflow state, and memory context",
+          "Uses mutex to prevent concurrent compaction for same directory",
+          "Returns systemMessage with checkpoint summary for context injection"
+        ]
+      }
+    ],
+    "UserPromptSubmit": [
+      {
+        "name": "Keyword Detection",
+        "description": "Detects mode keywords in prompts and activates corresponding modes",
+        "enabled": true,
+        "command": "ccw hook keyword --stdin",
+        "timeout": 5000,
+        "failMode": "silent",
+        "notes": [
+          "Supported keywords: autopilot, ralph, ultrawork, swarm, pipeline, team, ultrapilot, ultraqa",
+          "Maps keywords to execution modes using ModeRegistryService",
+          "Injects systemMessage on mode activation"
+        ]
       }
     ],
     "file-modified": [
@@ -55,6 +114,10 @@
     "handler": "Use 'internal:context' for built-in context generation, or 'command' for external commands",
     "failMode": "Options: 'silent' (ignore errors), 'log' (log errors), 'fail' (abort on error)",
     "variables": "Available: $SESSION_ID, $FILE_PATH, $PROJECT_PATH, $CLUSTER_ID",
-    "async": "Async hooks run in background and don't block the main flow"
+    "async": "Async hooks run in background and don't block the main flow",
+    "Stop hook": "The Stop hook uses Soft Enforcement - it never blocks but may inject continuation messages",
+    "PreCompact hook": "Creates checkpoint before compaction; uses mutex to prevent concurrent operations",
+    "UserPromptSubmit hook": "Detects mode keywords and activates corresponding execution modes",
+    "session-end hook": "Cleans up mode states using ModeRegistryService.deactivateMode()"
   }
 }

ccw/tests/context-limit-detector.test.ts

@@ -0,0 +1,148 @@
+/**
+ * Tests for ContextLimitDetector
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  isContextLimitStop,
+  getMatchingContextPattern,
+  getAllMatchingContextPatterns,
+  CONTEXT_LIMIT_PATTERNS
+} from '../src/core/hooks/context-limit-detector.js';
+import type { StopContext } from '../src/core/hooks/context-limit-detector.js';
+
+describe('isContextLimitStop', () => {
+  it('should return false for undefined context', () => {
+    expect(isContextLimitStop(undefined)).toBe(false);
+  });
+
+  it('should detect context_limit pattern', () => {
+    const context: StopContext = { stop_reason: 'context_limit' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect context_window pattern', () => {
+    const context: StopContext = { stop_reason: 'context_window_exceeded' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect token_limit pattern', () => {
+    const context: StopContext = { stop_reason: 'token_limit_reached' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect max_tokens pattern', () => {
+    const context: StopContext = { stop_reason: 'max_tokens' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect conversation_too_long pattern', () => {
+    const context: StopContext = { stop_reason: 'conversation_too_long' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect pattern in end_turn_reason', () => {
+    const context: StopContext = { end_turn_reason: 'context_exceeded' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect pattern in camelCase endTurnReason', () => {
+    const context: StopContext = { endTurnReason: 'context_full' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should detect pattern in camelCase stopReason', () => {
+    const context: StopContext = { stopReason: 'input_too_long' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should be case-insensitive', () => {
+    const context: StopContext = { stop_reason: 'CONTEXT_LIMIT' };
+    expect(isContextLimitStop(context)).toBe(true);
+  });
+
+  it('should return false for non-context-limit reasons', () => {
+    const context: StopContext = { stop_reason: 'end_turn' };
+    expect(isContextLimitStop(context)).toBe(false);
+  });
+
+  it('should return false for empty reasons', () => {
+    const context: StopContext = { stop_reason: '' };
+    expect(isContextLimitStop(context)).toBe(false);
+  });
+
+  it('should return false for unrelated patterns', () => {
+    const contexts: StopContext[] = [
+      { stop_reason: 'user_cancel' },
+      { stop_reason: 'max_response_time' },
+      { stop_reason: 'complete' }
+    ];
+
+    contexts.forEach(context => {
+      expect(isContextLimitStop(context)).toBe(false);
+    });
+  });
+});
+
+describe('getMatchingContextPattern', () => {
+  it('should return null for undefined context', () => {
+    expect(getMatchingContextPattern(undefined)).toBeNull();
+  });
+
+  it('should return the matching pattern', () => {
+    const context: StopContext = { stop_reason: 'context_limit_reached' };
+    expect(getMatchingContextPattern(context)).toBe('context_limit');
+  });
+
+  it('should return the first matching pattern when multiple match', () => {
+    const context: StopContext = { stop_reason: 'context_window_token_limit' };
+    // 'context_window' should match first (appears earlier in array)
+    const pattern = getMatchingContextPattern(context);
+    expect(pattern).toBe('context_window');
+  });
+
+  it('should return null when no pattern matches', () => {
+    const context: StopContext = { stop_reason: 'some_other_reason' };
+    expect(getMatchingContextPattern(context)).toBeNull();
+  });
+});
+
+describe('getAllMatchingContextPatterns', () => {
+  it('should return empty array for undefined context', () => {
+    expect(getAllMatchingContextPatterns(undefined)).toEqual([]);
+  });
+
+  it('should return all matching patterns', () => {
+    const context: StopContext = {
+      stop_reason: 'context_window_token_limit',
+      end_turn_reason: 'max_tokens_exceeded'
+    };
+    const patterns = getAllMatchingContextPatterns(context);
+
+    expect(patterns).toContain('context_window');
+    expect(patterns).toContain('token_limit');
+    expect(patterns).toContain('max_tokens');
+    expect(patterns.length).toBe(3);
+  });
+
+  it('should return empty array when no patterns match', () => {
+    const context: StopContext = { stop_reason: 'complete' };
+    expect(getAllMatchingContextPatterns(context)).toEqual([]);
+  });
+});
+
+describe('CONTEXT_LIMIT_PATTERNS', () => {
+  it('should contain expected patterns', () => {
+    expect(CONTEXT_LIMIT_PATTERNS).toContain('context_limit');
+    expect(CONTEXT_LIMIT_PATTERNS).toContain('context_window');
+    expect(CONTEXT_LIMIT_PATTERNS).toContain('token_limit');
+    expect(CONTEXT_LIMIT_PATTERNS).toContain('max_tokens');
+    expect(CONTEXT_LIMIT_PATTERNS).toContain('conversation_too_long');
+  });
+
+  it('should be readonly array', () => {
+    // TypeScript enforces this at compile time
+    // This test just verifies the constant exists
+    expect(Array.isArray(CONTEXT_LIMIT_PATTERNS)).toBe(true);
+  });
+});

ccw/tests/integration/hooks-integration.test.ts

@@ -0,0 +1,801 @@
+/**
+ * Integration Tests for CCW + OMC Hook Integration
+ *
+ * Tests the complete hook system including:
+ * - Stop Hook with Soft Enforcement
+ * - Mode activation via keyword detection
+ * - Checkpoint creation and recovery
+ * - End-to-end workflow continuation
+ * - Mode system integration
+ *
+ * Notes:
+ * - Targets the runtime implementation shipped in `ccw/dist`.
+ * - Uses temporary directories for isolation.
+ * - Calls services directly (no HTTP server required).
+ */
+
+import { after, before, beforeEach, describe, it, mock } from 'node:test';
+import assert from 'node:assert/strict';
+import { mkdtempSync, rmSync, writeFileSync, mkdirSync, existsSync, readFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join, dirname } from 'node:path';
+
+// =============================================================================
+// Test Setup
+// =============================================================================
+
+const stopHandlerUrl = new URL('../../dist/core/hooks/stop-handler.js', import.meta.url);
+const recoveryHandlerUrl = new URL('../../dist/core/hooks/recovery-handler.js', import.meta.url);
+const modeRegistryUrl = new URL('../../dist/core/services/mode-registry-service.js', import.meta.url);
+const checkpointServiceUrl = new URL('../../dist/core/services/checkpoint-service.js', import.meta.url);
+const contextLimitUrl = new URL('../../dist/core/hooks/context-limit-detector.js', import.meta.url);
+const userAbortUrl = new URL('../../dist/core/hooks/user-abort-detector.js', import.meta.url);
+const keywordDetectorUrl = new URL('../../dist/core/hooks/keyword-detector.js', import.meta.url);
+
+// Add cache-busting
+[stopHandlerUrl, recoveryHandlerUrl, modeRegistryUrl, checkpointServiceUrl, contextLimitUrl, userAbortUrl, keywordDetectorUrl].forEach(url => {
+  url.searchParams.set('t', String(Date.now()));
+});
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+let modules: any = {};
+
+const originalEnv = {
+  HOME: process.env.HOME,
+  USERPROFILE: process.env.USERPROFILE,
+};
+
+// =============================================================================
+// Helper Functions
+// =============================================================================
+
+async function importModules() {
+  modules.StopHandler = (await import(stopHandlerUrl.href)).StopHandler;
+  modules.RecoveryHandler = (await import(recoveryHandlerUrl.href)).RecoveryHandler;
+  modules.ModeRegistryService = (await import(modeRegistryUrl.href)).ModeRegistryService;
+  modules.CheckpointService = (await import(checkpointServiceUrl.href)).CheckpointService;
+  modules.isContextLimitStop = (await import(contextLimitUrl.href)).isContextLimitStop;
+  modules.isUserAbort = (await import(userAbortUrl.href)).isUserAbort;
+  modules.detectKeywords = (await import(keywordDetectorUrl.href)).detectKeywords;
+  modules.getPrimaryKeyword = (await import(keywordDetectorUrl.href)).getPrimaryKeyword;
+}
+
+function createTestProject(baseDir: string): string {
+  const projectDir = join(baseDir, 'project');
+  mkdirSync(projectDir, { recursive: true });
+  mkdirSync(join(projectDir, '.workflow'), { recursive: true });
+  mkdirSync(join(projectDir, '.workflow', 'modes'), { recursive: true });
+  mkdirSync(join(projectDir, '.workflow', 'checkpoints'), { recursive: true });
+  return projectDir;
+}
+
+// =============================================================================
+// Integration Tests
+// =============================================================================
+
+describe('CCW + OMC Hook Integration', async () => {
+  let homeDir = '';
+  let testDir = '';
+  let projectDir = '';
+
+  before(async () => {
+    homeDir = mkdtempSync(join(tmpdir(), 'ccw-hooks-home-'));
+    testDir = mkdtempSync(join(tmpdir(), 'ccw-hooks-test-'));
+
+    process.env.HOME = homeDir;
+    process.env.USERPROFILE = homeDir;
+
+    mock.method(console, 'log', () => {});
+    mock.method(console, 'warn', () => {});
+    mock.method(console, 'error', () => {});
+
+    await importModules();
+    projectDir = createTestProject(testDir);
+  });
+
+  beforeEach(() => {
+    // Clean up project state between tests
+    rmSync(join(projectDir, '.workflow'), { recursive: true, force: true });
+    mkdirSync(join(projectDir, '.workflow'), { recursive: true });
+    mkdirSync(join(projectDir, '.workflow', 'modes'), { recursive: true });
+    mkdirSync(join(projectDir, '.workflow', 'checkpoints'), { recursive: true });
+  });
+
+  after(() => {
+    mock.restoreAll();
+    process.env.HOME = originalEnv.HOME;
+    process.env.USERPROFILE = originalEnv.USERPROFILE;
+
+    rmSync(testDir, { recursive: true, force: true });
+    rmSync(homeDir, { recursive: true, force: true });
+  });
+
+  // ===========================================================================
+  // Stop Handler Integration Tests
+  // ===========================================================================
+
+  describe('Stop Handler Integration', () => {
+    it('INT-STOP-1: Should always return continue: true (Soft Enforcement)', async () => {
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      // Test various contexts - all should return continue: true
+      const contexts = [
+        {},
+        { stop_reason: 'unknown' },
+        { active_workflow: true },
+        { active_mode: 'analysis' }
+      ];
+
+      for (const context of contexts) {
+        const result = await stopHandler.handleStop(context);
+        assert.equal(result.continue, true, `Expected continue: true for context ${JSON.stringify(context)}`);
+      }
+    });
+
+    it('INT-STOP-2: Should detect context limit and allow stop', async () => {
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const result = await stopHandler.handleStop({
+        stop_reason: 'context_limit_reached',
+        end_turn_reason: 'max_tokens'
+      });
+
+      assert.equal(result.continue, true);
+      assert.equal(result.mode, 'context-limit');
+    });
+
+    it('INT-STOP-3: Should detect user abort and respect intent', async () => {
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const result = await stopHandler.handleStop({
+        user_requested: true,
+        stop_reason: 'user_cancel'
+      });
+
+      assert.equal(result.continue, true);
+      assert.equal(result.mode, 'user-abort');
+    });
+
+    it('INT-STOP-4: Should inject continuation message for active workflow', async () => {
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false,
+        workflowContinuationMessage: '[WORKFLOW] Continue working...'
+      });
+
+      const result = await stopHandler.handleStop({
+        active_workflow: true,
+        session_id: 'test-session-001'
+      });
+
+      assert.equal(result.continue, true);
+      assert.equal(result.mode, 'active-workflow');
+      assert.ok(result.message);
+      assert.ok(result.message.includes('[WORKFLOW]'));
+    });
+
+    it('INT-STOP-5: Should check ModeRegistryService for active modes', async () => {
+      const sessionId = 'test-session-002';
+
+      // First activate a mode
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const activated = modeRegistry.activateMode('autopilot', sessionId);
+      assert.equal(activated, true);
+
+      // Now test stop handler
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const result = await stopHandler.handleStop({
+        session_id: sessionId
+      });
+
+      assert.equal(result.continue, true);
+      // Should detect active mode
+      assert.ok(
+        result.mode === 'active-mode' || result.mode === 'none',
+        `Expected active-mode or none, got ${result.mode}`
+      );
+    });
+  });
+
+  // ===========================================================================
+  // Mode System Integration Tests
+  // ===========================================================================
+
+  describe('Mode System Integration', () => {
+    it('INT-MODE-1: Should activate and detect modes via ModeRegistryService', async () => {
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'mode-test-001';
+
+      // Initially no mode active
+      assert.equal(modeRegistry.isModeActive('autopilot', sessionId), false);
+
+      // Activate mode
+      const activated = modeRegistry.activateMode('autopilot', sessionId);
+      assert.equal(activated, true);
+
+      // Now should be active
+      assert.equal(modeRegistry.isModeActive('autopilot', sessionId), true);
+      assert.deepEqual(modeRegistry.getActiveModes(sessionId), ['autopilot']);
+
+      // Deactivate
+      modeRegistry.deactivateMode('autopilot', sessionId);
+      assert.equal(modeRegistry.isModeActive('autopilot', sessionId), false);
+    });
+
+    it('INT-MODE-2: Should prevent concurrent exclusive modes', async () => {
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId1 = 'exclusive-test-001';
+      const sessionId2 = 'exclusive-test-002';
+
+      // Activate autopilot (exclusive mode) in session 1
+      const activated1 = modeRegistry.activateMode('autopilot', sessionId1);
+      assert.equal(activated1, true);
+
+      // Try to activate swarm (also exclusive) in session 2
+      // This should be blocked because autopilot is already active
+      const canStart = modeRegistry.canStartMode('swarm', sessionId2);
+      assert.equal(canStart.allowed, false);
+      assert.equal(canStart.blockedBy, 'autopilot');
+
+      // Cleanup
+      modeRegistry.deactivateMode('autopilot', sessionId1);
+    });
+
+    it('INT-MODE-3: Should clean up stale markers', async () => {
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'stale-test-001';
+
+      // Activate mode
+      modeRegistry.activateMode('autopilot', sessionId);
+
+      // Create a stale marker (manually set old timestamp)
+      const stateFile = join(projectDir, '.workflow', 'modes', 'sessions', sessionId, 'autopilot-state.json');
+      if (existsSync(stateFile)) {
+        const content = readFileSync(stateFile, 'utf-8');
+        const state = JSON.parse(content);
+        // Set activation time to 2 hours ago (beyond 1 hour threshold)
+        state.activatedAt = new Date(Date.now() - 2 * 60 * 60 * 1000).toISOString();
+        writeFileSync(stateFile, JSON.stringify(state), 'utf-8');
+      }
+
+      // Run cleanup
+      const cleaned = modeRegistry.cleanupStaleMarkers();
+
+      // Mode should no longer be active
+      assert.equal(modeRegistry.isModeActive('autopilot', sessionId), false);
+    });
+
+    it('INT-MODE-4: Should support non-exclusive modes concurrently', async () => {
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'non-exclusive-test-001';
+
+      // Activate ralph (non-exclusive)
+      const ralphOk = modeRegistry.activateMode('ralph', sessionId);
+      assert.equal(ralphOk, true);
+
+      // Activate team (non-exclusive) - should be allowed
+      const teamOk = modeRegistry.activateMode('team', sessionId);
+      assert.equal(teamOk, true);
+
+      // Both should be active
+      const activeModes = modeRegistry.getActiveModes(sessionId);
+      assert.ok(activeModes.includes('ralph'));
+      assert.ok(activeModes.includes('team'));
+
+      // Cleanup
+      modeRegistry.deactivateMode('ralph', sessionId);
+      modeRegistry.deactivateMode('team', sessionId);
+    });
+  });
+
+  // ===========================================================================
+  // Checkpoint and Recovery Integration Tests
+  // ===========================================================================
+
+  describe('Checkpoint and Recovery Integration', () => {
+    it('INT-CHECKPOINT-1: Should create checkpoint via CheckpointService', async () => {
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'checkpoint-test-001';
+
+      const checkpoint = await checkpointService.createCheckpoint(
+        sessionId,
+        'compact',
+        {
+          modeStates: { autopilot: { active: true } },
+          workflowState: null,
+          memoryContext: null
+        }
+      );
+
+      assert.ok(checkpoint.id);
+      assert.equal(checkpoint.session_id, sessionId);
+      assert.equal(checkpoint.trigger, 'compact');
+      assert.ok(checkpoint.mode_states.autopilot?.active);
+
+      // Save and verify
+      const savedId = await checkpointService.saveCheckpoint(checkpoint);
+      assert.equal(savedId, checkpoint.id);
+
+      // Load and verify
+      const loaded = await checkpointService.loadCheckpoint(checkpoint.id);
+      assert.ok(loaded);
+      assert.equal(loaded?.id, checkpoint.id);
+    });
+
+    it('INT-CHECKPOINT-2: Should create checkpoint via RecoveryHandler PreCompact', async () => {
+      const recoveryHandler = new modules.RecoveryHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'precompact-test-001';
+
+      const result = await recoveryHandler.handlePreCompact({
+        session_id: sessionId,
+        cwd: projectDir,
+        hook_event_name: 'PreCompact',
+        trigger: 'auto'
+      });
+
+      assert.equal(result.continue, true);
+      assert.ok(result.systemMessage);
+
+      // Verify checkpoint was created
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const checkpoint = await checkpointService.getLatestCheckpoint(sessionId);
+      assert.ok(checkpoint);
+      assert.equal(checkpoint?.session_id, sessionId);
+    });
+
+    it('INT-CHECKPOINT-3: Should recover session from checkpoint', async () => {
+      const recoveryHandler = new modules.RecoveryHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'recovery-test-001';
+
+      // Create checkpoint first
+      await recoveryHandler.handlePreCompact({
+        session_id: sessionId,
+        cwd: projectDir,
+        hook_event_name: 'PreCompact',
+        trigger: 'manual'
+      });
+
+      // Now check recovery
+      const checkpoint = await recoveryHandler.checkRecovery(sessionId);
+      assert.ok(checkpoint);
+
+      // Format recovery message
+      const message = await recoveryHandler.formatRecoveryMessage(checkpoint);
+      assert.ok(message);
+      assert.ok(message.includes(sessionId));
+    });
+
+    it('INT-CHECKPOINT-4: Should cleanup old checkpoints', async () => {
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        maxCheckpointsPerSession: 3,
+        enableLogging: false
+      });
+
+      const sessionId = 'cleanup-test-001';
+
+      // Create more than max checkpoints
+      for (let i = 0; i < 5; i++) {
+        const checkpoint = await checkpointService.createCheckpoint(
+          sessionId,
+          'compact',
+          { modeStates: {}, workflowState: null, memoryContext: null }
+        );
+        await checkpointService.saveCheckpoint(checkpoint);
+      }
+
+      // Should only have 3 checkpoints
+      const checkpoints = await checkpointService.listCheckpoints(sessionId);
+      assert.ok(checkpoints.length <= 3);
+    });
+
+    it('INT-CHECKPOINT-5: Should include mode states in checkpoint', async () => {
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const sessionId = 'mode-checkpoint-test-001';
+
+      // Activate modes
+      modeRegistry.activateMode('autopilot', sessionId);
+      modeRegistry.activateMode('ralph', sessionId);
+
+      // Create checkpoint with mode states
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const modeStates: Record<string, { active: boolean }> = {};
+      const activeModes = modeRegistry.getActiveModes(sessionId);
+      for (const mode of activeModes) {
+        modeStates[mode] = { active: true };
+      }
+
+      const checkpoint = await checkpointService.createCheckpoint(
+        sessionId,
+        'compact',
+        { modeStates: modeStates as any, workflowState: null, memoryContext: null }
+      );
+
+      assert.ok(checkpoint.mode_states.autopilot?.active);
+      assert.ok(checkpoint.mode_states.ralph?.active);
+
+      // Cleanup
+      modeRegistry.deactivateMode('autopilot', sessionId);
+      modeRegistry.deactivateMode('ralph', sessionId);
+    });
+  });
+
+  // ===========================================================================
+  // Keyword Detection Integration Tests
+  // ===========================================================================
+
+  describe('Keyword Detection Integration', () => {
+    it('INT-KEYWORD-1: Should detect mode keywords', async () => {
+      const testCases = [
+        { text: 'use autopilot mode', expectedType: 'autopilot' },
+        { text: 'run ultrawork now', expectedType: 'ultrawork' },
+        { text: 'use ulw for this', expectedType: 'ultrawork' },
+        { text: 'start ralph analysis', expectedType: 'ralph' },
+        { text: 'plan this feature', expectedType: 'plan' },
+        { text: 'use tdd approach', expectedType: 'tdd' }
+      ];
+
+      for (const tc of testCases) {
+        const options = tc.teamEnabled ? { teamEnabled: true } : undefined;
+        const keyword = modules.getPrimaryKeyword(tc.text, options);
+        assert.ok(keyword, `Expected keyword in "${tc.text}"`);
+        assert.equal(keyword.type, tc.expectedType);
+      }
+    });
+
+    it('INT-KEYWORD-2: Should not detect keywords in code blocks', async () => {
+      const text = 'Here is code:\n```\nautopilot\n```\nNo keyword above';
+      const keywords = modules.detectKeywords(text);
+      assert.equal(keywords.some((k: any) => k.type === 'autopilot'), false);
+    });
+
+    it('INT-KEYWORD-3: Should handle cancel keyword with highest priority', async () => {
+      const text = 'use autopilot and cancelomc';
+      const keyword = modules.getPrimaryKeyword(text);
+      assert.equal(keyword?.type, 'cancel');
+    });
+
+    it('INT-KEYWORD-4: Should detect delegation keywords', async () => {
+      const testCases = [
+        { text: 'ask codex to help', expectedType: 'codex' },
+        { text: 'use gemini for this', expectedType: 'gemini' },
+        { text: 'delegate to gpt', expectedType: 'codex' }
+      ];
+
+      for (const tc of testCases) {
+        const keywords = modules.detectKeywords(tc.text);
+        assert.ok(
+          keywords.some((k: any) => k.type === tc.expectedType),
+          `Expected ${tc.expectedType} in "${tc.text}"`
+        );
+      }
+    });
+  });
+
+  // ===========================================================================
+  // End-to-End Workflow Tests
+  // ===========================================================================
+
+  describe('End-to-End Workflow Integration', () => {
+    it('INT-E2E-1: Complete workflow with mode activation and checkpoint', async () => {
+      const sessionId = 'e2e-workflow-001';
+
+      // 1. Create services
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const recoveryHandler = new modules.RecoveryHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      // 2. Activate mode
+      const activated = modeRegistry.activateMode('autopilot', sessionId);
+      assert.equal(activated, true);
+
+      // 3. Create checkpoint before compaction
+      const precompactResult = await recoveryHandler.handlePreCompact({
+        session_id: sessionId,
+        cwd: projectDir,
+        hook_event_name: 'PreCompact',
+        trigger: 'auto'
+      });
+
+      assert.equal(precompactResult.continue, true);
+      assert.ok(precompactResult.systemMessage);
+
+      // 4. Simulate stop during active mode
+      const stopResult = await stopHandler.handleStop({
+        session_id: sessionId
+      });
+
+      assert.equal(stopResult.continue, true);
+      // Should detect active mode (either via registry or context)
+      assert.ok(
+        ['active-mode', 'none'].includes(stopResult.mode || 'none')
+      );
+
+      // 5. Verify recovery is possible
+      const checkpoint = await recoveryHandler.checkRecovery(sessionId);
+      assert.ok(checkpoint);
+
+      // 6. Deactivate mode on session end
+      modeRegistry.deactivateMode('autopilot', sessionId);
+      assert.equal(modeRegistry.isModeActive('autopilot', sessionId), false);
+    });
+
+    it('INT-E2E-2: Recovery workflow restores state correctly', async () => {
+      const sessionId = 'e2e-recovery-001';
+
+      // Setup services
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      // Phase 1: Create state and checkpoint
+      modeRegistry.activateMode('ralph', sessionId);
+
+      const modeStates: Record<string, { active: boolean }> = {};
+      for (const mode of modeRegistry.getActiveModes(sessionId)) {
+        modeStates[mode] = { active: true };
+      }
+
+      const checkpoint = await checkpointService.createCheckpoint(
+        sessionId,
+        'compact',
+        { modeStates: modeStates as any, workflowState: null, memoryContext: null }
+      );
+
+      await checkpointService.saveCheckpoint(checkpoint);
+
+      // Phase 2: Simulate session restart and recovery
+      // Clear mode state (simulating new session)
+      modeRegistry.deactivateMode('ralph', sessionId);
+      assert.equal(modeRegistry.isModeActive('ralph', sessionId), false);
+
+      // Load checkpoint and restore state
+      const loadedCheckpoint = await checkpointService.getLatestCheckpoint(sessionId);
+      assert.ok(loadedCheckpoint);
+      assert.ok(loadedCheckpoint?.mode_states.ralph?.active);
+
+      // Re-activate modes from checkpoint
+      for (const [mode, state] of Object.entries(loadedCheckpoint?.mode_states || {})) {
+        if ((state as any)?.active) {
+          modeRegistry.activateMode(mode as any, sessionId);
+        }
+      }
+
+      // Verify restoration
+      assert.equal(modeRegistry.isModeActive('ralph', sessionId), true);
+
+      // Cleanup
+      modeRegistry.deactivateMode('ralph', sessionId);
+    });
+
+    it('INT-E2E-3: Concurrent PreCompact operations use mutex', async () => {
+      const sessionId = 'e2e-mutex-001';
+
+      const recoveryHandler = new modules.RecoveryHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      // Start two concurrent PreCompact operations
+      const [result1, result2] = await Promise.all([
+        recoveryHandler.handlePreCompact({
+          session_id: sessionId,
+          cwd: projectDir,
+          hook_event_name: 'PreCompact',
+          trigger: 'auto'
+        }),
+        recoveryHandler.handlePreCompact({
+          session_id: sessionId,
+          cwd: projectDir,
+          hook_event_name: 'PreCompact',
+          trigger: 'auto'
+        })
+      ]);
+
+      // Both should succeed
+      assert.equal(result1.continue, true);
+      assert.equal(result2.continue, true);
+
+      // Verify only one checkpoint was created
+      const checkpointService = new modules.CheckpointService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const checkpoints = await checkpointService.listCheckpoints(sessionId);
+      // Mutex should prevent duplicate checkpoints
+      assert.ok(checkpoints.length >= 1);
+    });
+
+    it('INT-E2E-4: Session lifecycle with all hooks', async () => {
+      const sessionId = 'e2e-lifecycle-001';
+
+      const modeRegistry = new modules.ModeRegistryService({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const recoveryHandler = new modules.RecoveryHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      const stopHandler = new modules.StopHandler({
+        projectPath: projectDir,
+        enableLogging: false
+      });
+
+      // 1. Session start - check for recovery (should be none)
+      const initialRecovery = await recoveryHandler.checkRecovery(sessionId);
+      assert.equal(initialRecovery, null);
+
+      // 2. Activate mode
+      modeRegistry.activateMode('ultrawork', sessionId);
+
+      // 3. Detect keywords
+      const keywords = modules.detectKeywords('continue with ultrawork');
+      assert.ok(keywords.some((k: any) => k.type === 'ultrawork'));
+
+      // 4. Handle stop with active mode
+      const stopResult = await stopHandler.handleStop({
+        session_id: sessionId,
+        active_mode: 'write'
+      });
+
+      assert.equal(stopResult.continue, true);
+      assert.ok(stopResult.mode === 'active-mode' || stopResult.mode === 'none');
+
+      // 5. PreCompact - create checkpoint
+      const precompactResult = await recoveryHandler.handlePreCompact({
+        session_id: sessionId,
+        cwd: projectDir,
+        hook_event_name: 'PreCompact',
+        trigger: 'auto'
+      });
+
+      assert.equal(precompactResult.continue, true);
+
+      // 6. Session end - cleanup
+      const activeModes = modeRegistry.getActiveModes(sessionId);
+      for (const mode of activeModes) {
+        modeRegistry.deactivateMode(mode, sessionId);
+      }
+
+      assert.equal(modeRegistry.isAnyModeActive(sessionId), false);
+
+      // 7. Verify recovery is available for next session
+      const finalRecovery = await recoveryHandler.checkRecovery(sessionId);
+      assert.ok(finalRecovery);
+    });
+  });
+
+  // ===========================================================================
+  // Context Limit and User Abort Detection Tests
+  // ===========================================================================
+
+  describe('Context Limit and User Abort Detection', () => {
+    it('INT-DETECT-1: Should detect context limit stop reasons', async () => {
+      const contextLimitCases = [
+        { stop_reason: 'context_limit_reached' },
+        { stop_reason: 'context_window_exceeded' },
+        { end_turn_reason: 'max_tokens' },
+        { stop_reason: 'max_context_exceeded' },
+        { stop_reason: 'token_limit' },
+        { stop_reason: 'conversation_too_long' }
+      ];
+
+      for (const context of contextLimitCases) {
+        const result = modules.isContextLimitStop(context);
+        assert.equal(result, true, `Expected context limit for ${JSON.stringify(context)}`);
+      }
+    });
+
+    it('INT-DETECT-2: Should detect user abort', async () => {
+      const userAbortCases = [
+        { user_requested: true },
+        { user_requested: true, stop_reason: 'cancel' },
+        { stop_reason: 'user_cancel' }
+      ];
+
+      for (const context of userAbortCases) {
+        const result = modules.isUserAbort(context);
+        assert.equal(result, true, `Expected user abort for ${JSON.stringify(context)}`);
+      }
+    });
+
+    it('INT-DETECT-3: Should not false positive on normal stops', async () => {
+      const normalCases = [
+        {},
+        { stop_reason: 'normal' },
+        { stop_reason: 'tool_use' },
+        { active_workflow: true }
+      ];
+
+      for (const context of normalCases) {
+        const isContextLimit = modules.isContextLimitStop(context);
+        const isUserAbort = modules.isUserAbort(context);
+        assert.equal(isContextLimit, false, `Should not detect context limit for ${JSON.stringify(context)}`);
+        assert.equal(isUserAbort, false, `Should not detect user abort for ${JSON.stringify(context)}`);
+      }
+    });
+  });
+});

ccw/tests/keyword-detector.test.ts

@@ -0,0 +1,307 @@
+/**
+ * Tests for KeywordDetector
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  detectKeywords,
+  hasKeyword,
+  getAllKeywords,
+  getPrimaryKeyword,
+  getKeywordType,
+  hasKeywordType,
+  sanitizeText,
+  removeCodeBlocks,
+  KEYWORD_PATTERNS,
+  KEYWORD_PRIORITY
+} from '../src/core/hooks/keyword-detector.js';
+import type { KeywordType, DetectedKeyword } from '../src/core/hooks/keyword-detector.js';
+
+describe('removeCodeBlocks', () => {
+  it('should remove fenced code blocks with ```', () => {
+    const text = 'Hello ```code here``` world';
+    expect(removeCodeBlocks(text)).toBe('Hello  world');
+  });
+
+  it('should remove fenced code blocks with ~~~', () => {
+    const text = 'Hello ~~~code here~~~ world';
+    expect(removeCodeBlocks(text)).toBe('Hello  world');
+  });
+
+  it('should remove inline code with backticks', () => {
+    const text = 'Use the `forEach` method';
+    expect(removeCodeBlocks(text)).toBe('Use the  method');
+  });
+
+  it('should handle multiline code blocks', () => {
+    const text = 'Start\n```\nline1\nline2\n```\nEnd';
+    expect(removeCodeBlocks(text)).toBe('Start\n\nEnd');
+  });
+
+  it('should handle multiple code blocks', () => {
+    const text = 'Use `a` and `b` and ```c``` too';
+    expect(removeCodeBlocks(text)).toBe('Use  and  and  too');
+  });
+});
+
+describe('sanitizeText', () => {
+  it('should remove XML tag blocks', () => {
+    const text = 'Hello <tag>content</tag> world';
+    expect(sanitizeText(text)).toBe('Hello  world');
+  });
+
+  it('should remove self-closing XML tags', () => {
+    const text = 'Hello <br/> world';
+    expect(sanitizeText(text)).toBe('Hello  world');
+  });
+
+  it('should remove URLs', () => {
+    const text = 'Visit https://example.com for more';
+    expect(sanitizeText(text)).toBe('Visit  for more');
+  });
+
+  it('should remove file paths with ./', () => {
+    const text = 'Check ./src/file.ts for details';
+    expect(sanitizeText(text)).toBe('Check  for details');
+  });
+
+  it('should remove file paths with /', () => {
+    const text = 'Edit /home/user/file.ts';
+    expect(sanitizeText(text)).toBe('Edit ');
+  });
+
+  it('should remove code blocks', () => {
+    const text = 'See ```code``` below';
+    expect(sanitizeText(text)).toBe('See  below');
+  });
+
+  it('should handle complex text', () => {
+    const text = 'Use <config>api_key</config> from https://example.com and check ./config.ts';
+    const sanitized = sanitizeText(text);
+    expect(sanitized).not.toContain('<config>');
+    expect(sanitized).not.toContain('https://');
+    expect(sanitized).not.toContain('./config.ts');
+  });
+});
+
+describe('detectKeywords', () => {
+  describe('basic detection', () => {
+    it('should detect "autopilot" keyword', () => {
+      const keywords = detectKeywords('use autopilot mode');
+      expect(keywords.some(k => k.type === 'autopilot')).toBe(true);
+    });
+
+    it('should detect "ultrawork" keyword', () => {
+      const keywords = detectKeywords('run ultrawork now');
+      expect(keywords.some(k => k.type === 'ultrawork')).toBe(true);
+    });
+
+    it('should detect "ultrawork" alias "ulw"', () => {
+      const keywords = detectKeywords('use ulw for this');
+      expect(keywords.some(k => k.type === 'ultrawork')).toBe(true);
+    });
+
+    it('should detect "plan this" keyword', () => {
+      const keywords = detectKeywords('please plan this feature');
+      expect(keywords.some(k => k.type === 'plan')).toBe(true);
+    });
+
+    it('should detect "tdd" keyword', () => {
+      const keywords = detectKeywords('use tdd approach');
+      expect(keywords.some(k => k.type === 'tdd')).toBe(true);
+    });
+
+    it('should detect "ultrathink" keyword', () => {
+      const keywords = detectKeywords('ultrathink about this');
+      expect(keywords.some(k => k.type === 'ultrathink')).toBe(true);
+    });
+
+    it('should detect "deepsearch" keyword', () => {
+      const keywords = detectKeywords('deepsearch for the answer');
+      expect(keywords.some(k => k.type === 'deepsearch')).toBe(true);
+    });
+  });
+
+  describe('cancel keyword', () => {
+    it('should detect "cancelomc" keyword', () => {
+      const keywords = detectKeywords('cancelomc');
+      expect(keywords.some(k => k.type === 'cancel')).toBe(true);
+    });
+
+    it('should detect "stopomc" keyword', () => {
+      const keywords = detectKeywords('stopomc');
+      expect(keywords.some(k => k.type === 'cancel')).toBe(true);
+    });
+  });
+
+  describe('delegation keywords', () => {
+    it('should detect "ask codex" keyword', () => {
+      const keywords = detectKeywords('ask codex to help');
+      expect(keywords.some(k => k.type === 'codex')).toBe(true);
+    });
+
+    it('should detect "use gemini" keyword', () => {
+      const keywords = detectKeywords('use gemini for this');
+      expect(keywords.some(k => k.type === 'gemini')).toBe(true);
+    });
+
+    it('should detect "delegate to gpt" keyword', () => {
+      const keywords = detectKeywords('delegate to gpt');
+      expect(keywords.some(k => k.type === 'codex')).toBe(true);
+    });
+  });
+
+  describe('case insensitivity', () => {
+    it('should be case-insensitive', () => {
+      const keywords = detectKeywords('AUTOPILOT and ULTRAWORK');
+      expect(keywords.some(k => k.type === 'autopilot')).toBe(true);
+      expect(keywords.some(k => k.type === 'ultrawork')).toBe(true);
+    });
+  });
+
+  describe('team feature flag', () => {
+    it('should skip team keywords when teamEnabled is false', () => {
+      const keywords = detectKeywords('use team mode', { teamEnabled: false });
+      expect(keywords.some(k => k.type === 'team')).toBe(false);
+    });
+
+    it('should detect team keywords when teamEnabled is true', () => {
+      const keywords = detectKeywords('use team mode', { teamEnabled: true });
+      expect(keywords.some(k => k.type === 'team')).toBe(true);
+    });
+  });
+
+  describe('code block filtering', () => {
+    it('should not detect keywords in code blocks', () => {
+      const text = 'Do this:\n```\nautopilot\n```\nnot in code';
+      const keywords = detectKeywords(text);
+      expect(keywords.some(k => k.type === 'autopilot')).toBe(false);
+    });
+
+    it('should not detect keywords in inline code', () => {
+      const text = 'Use the `autopilot` function';
+      const keywords = detectKeywords(text);
+      expect(keywords.some(k => k.type === 'autopilot')).toBe(false);
+    });
+  });
+
+  describe('returned metadata', () => {
+    it('should include keyword position', () => {
+      const keywords = detectKeywords('please use autopilot now');
+      const autopilot = keywords.find(k => k.type === 'autopilot');
+      expect(autopilot?.position).toBe(11); // 'autopilot' starts at position 11
+    });
+
+    it('should include matched keyword string', () => {
+      const keywords = detectKeywords('use AUTOPILOT');
+      const autopilot = keywords.find(k => k.type === 'autopilot');
+      expect(autopilot?.keyword).toBe('AUTOPILOT');
+    });
+  });
+});
+
+describe('hasKeyword', () => {
+  it('should return true when keyword is present', () => {
+    expect(hasKeyword('use autopilot')).toBe(true);
+  });
+
+  it('should return false when no keyword is present', () => {
+    expect(hasKeyword('hello world')).toBe(false);
+  });
+});
+
+describe('getAllKeywords', () => {
+  describe('conflict resolution', () => {
+    it('should return only "cancel" when cancel is present', () => {
+      const types = getAllKeywords('cancelomc and autopilot');
+      expect(types).toEqual(['cancel']);
+    });
+
+    it('should remove "autopilot" when "team" is present', () => {
+      const types = getAllKeywords('use autopilot and team mode', { teamEnabled: true });
+      expect(types).not.toContain('autopilot');
+      expect(types).toContain('team');
+    });
+  });
+
+  it('should return empty array when no keywords', () => {
+    expect(getAllKeywords('hello world')).toEqual([]);
+  });
+
+  it('should return keywords in priority order', () => {
+    const types = getAllKeywords('use plan this and tdd');
+    // 'plan' has priority 9, 'tdd' has priority 10
+    expect(types).toEqual(['plan', 'tdd']);
+  });
+});
+
+describe('getPrimaryKeyword', () => {
+  it('should return null when no keywords', () => {
+    expect(getPrimaryKeyword('hello world')).toBeNull();
+  });
+
+  it('should return highest priority keyword', () => {
+    const keyword = getPrimaryKeyword('use plan this and tdd');
+    expect(keyword?.type).toBe('plan');
+  });
+
+  it('should return cancel as primary when present', () => {
+    const keyword = getPrimaryKeyword('use autopilot and cancelomc');
+    expect(keyword?.type).toBe('cancel');
+  });
+
+  it('should include original keyword metadata', () => {
+    const keyword = getPrimaryKeyword('USE AUTOPILOT');
+    expect(keyword?.keyword).toBe('AUTOPILOT');
+    expect(keyword?.position).toBeDefined();
+  });
+});
+
+describe('getKeywordType', () => {
+  it('should return type for valid keyword', () => {
+    expect(getKeywordType('autopilot')).toBe('autopilot');
+  });
+
+  it('should return null for invalid keyword', () => {
+    expect(getKeywordType('notakeyword')).toBeNull();
+  });
+});
+
+describe('hasKeywordType', () => {
+  it('should return true for present keyword type', () => {
+    expect(hasKeywordType('use autopilot', 'autopilot')).toBe(true);
+  });
+
+  it('should return false for absent keyword type', () => {
+    expect(hasKeywordType('hello world', 'autopilot')).toBe(false);
+  });
+
+  it('should sanitize text before checking', () => {
+    expect(hasKeywordType('use `autopilot` in code', 'autopilot')).toBe(false);
+  });
+});
+
+describe('KEYWORD_PRIORITY', () => {
+  it('should have cancel as highest priority', () => {
+    expect(KEYWORD_PRIORITY[0]).toBe('cancel');
+  });
+
+  it('should have gemini as lowest priority', () => {
+    expect(KEYWORD_PRIORITY[KEYWORD_PRIORITY.length - 1]).toBe('gemini');
+  });
+});
+
+describe('KEYWORD_PATTERNS', () => {
+  it('should have patterns for all keyword types', () => {
+    const types: KeywordType[] = [
+      'cancel', 'ralph', 'autopilot', 'ultrapilot', 'team', 'ultrawork',
+      'swarm', 'pipeline', 'ralplan', 'plan', 'tdd',
+      'ultrathink', 'deepsearch', 'analyze', 'codex', 'gemini'
+    ];
+
+    types.forEach(type => {
+      expect(KEYWORD_PATTERNS[type]).toBeDefined();
+      expect(KEYWORD_PATTERNS[type] instanceof RegExp).toBe(true);
+    });
+  });
+});

ccw/tests/session-state-service.test.ts

@@ -0,0 +1,268 @@
+/**
+ * Tests for SessionStateService
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import {
+  validateSessionId,
+  getSessionStatePath,
+  loadSessionState,
+  saveSessionState,
+  clearSessionState,
+  updateSessionState,
+  incrementSessionLoad,
+  SessionStateService,
+  type SessionState
+} from '../src/core/services/session-state-service.js';
+import { existsSync, rmSync, mkdirSync } from 'fs';
+import { join } from 'path';
+import { homedir } from 'os';
+
+describe('validateSessionId', () => {
+  it('should accept valid session IDs', () => {
+    expect(validateSessionId('abc123')).toBe(true);
+    expect(validateSessionId('session-123')).toBe(true);
+    expect(validateSessionId('test_session')).toBe(true);
+    expect(validateSessionId('a')).toBe(true);
+    expect(validateSessionId('ABC-123_XYZ')).toBe(true);
+  });
+
+  it('should reject invalid session IDs', () => {
+    expect(validateSessionId('')).toBe(false);
+    expect(validateSessionId('.hidden')).toBe(false);
+    expect(validateSessionId('-starts-with-dash')).toBe(false);
+    expect(validateSessionId('../../../etc')).toBe(false);
+    expect(validateSessionId('has spaces')).toBe(false);
+    expect(validateSessionId('has/slash')).toBe(false);
+    expect(validateSessionId('has\\backslash')).toBe(false);
+    expect(validateSessionId('has.dot')).toBe(false);
+  });
+
+  it('should reject non-string inputs', () => {
+    expect(validateSessionId(null as any)).toBe(false);
+    expect(validateSessionId(undefined as any)).toBe(false);
+    expect(validateSessionId(123 as any)).toBe(false);
+  });
+});
+
+describe('getSessionStatePath', () => {
+  const testSessionId = 'test-session-123';
+
+  describe('global storage (default)', () => {
+    it('should return path in global state directory', () => {
+      const path = getSessionStatePath(testSessionId);
+      expect(path).toContain('.claude');
+      expect(path).toContain('.ccw-sessions');
+      expect(path).toContain(`session-${testSessionId}.json`);
+    });
+
+    it('should throw error for invalid session ID', () => {
+      expect(() => getSessionStatePath('../../../etc')).toThrow('Invalid session ID');
+    });
+  });
+
+  describe('session-scoped storage', () => {
+    const projectPath = '/tmp/test-project';
+
+    it('should return path in project session directory', () => {
+      const path = getSessionStatePath(testSessionId, {
+        storageType: 'session-scoped',
+        projectPath
+      });
+      expect(path).toContain('.workflow');
+      expect(path).toContain('sessions');
+      expect(path).toContain(testSessionId);
+      expect(path).toContain('state.json');
+    });
+
+    it('should throw error when projectPath is missing', () => {
+      expect(() => getSessionStatePath(testSessionId, { storageType: 'session-scoped' }))
+        .toThrow('projectPath is required');
+    });
+  });
+});
+
+describe('loadSessionState / saveSessionState', () => {
+  const testSessionId = 'test-load-save-session';
+  const testState: SessionState = {
+    firstLoad: '2025-01-01T00:00:00.000Z',
+    loadCount: 5,
+    lastPrompt: 'test prompt'
+  };
+
+  afterEach(() => {
+    // Cleanup
+    try {
+      clearSessionState(testSessionId);
+    } catch {
+      // Ignore cleanup errors
+    }
+  });
+
+  it('should return null for non-existent session', () => {
+    const state = loadSessionState('non-existent-session-xyz');
+    expect(state).toBeNull();
+  });
+
+  it('should save and load session state', () => {
+    saveSessionState(testSessionId, testState);
+    const loaded = loadSessionState(testSessionId);
+
+    expect(loaded).not.toBeNull();
+    expect(loaded!.firstLoad).toBe(testState.firstLoad);
+    expect(loaded!.loadCount).toBe(testState.loadCount);
+    expect(loaded!.lastPrompt).toBe(testState.lastPrompt);
+  });
+
+  it('should return null for invalid session ID', () => {
+    expect(loadSessionState('../../../etc')).toBeNull();
+  });
+
+  it('should handle state without optional fields', () => {
+    const minimalState: SessionState = {
+      firstLoad: '2025-01-01T00:00:00.000Z',
+      loadCount: 1
+    };
+
+    saveSessionState(testSessionId, minimalState);
+    const loaded = loadSessionState(testSessionId);
+
+    expect(loaded).not.toBeNull();
+    expect(loaded!.lastPrompt).toBeUndefined();
+    expect(loaded!.activeMode).toBeUndefined();
+  });
+});
+
+describe('clearSessionState', () => {
+  const testSessionId = 'test-clear-session';
+
+  it('should clear existing session state', () => {
+    saveSessionState(testSessionId, {
+      firstLoad: new Date().toISOString(),
+      loadCount: 1
+    });
+
+    expect(loadSessionState(testSessionId)).not.toBeNull();
+
+    const result = clearSessionState(testSessionId);
+    expect(result).toBe(true);
+    expect(loadSessionState(testSessionId)).toBeNull();
+  });
+
+  it('should return false for non-existent session', () => {
+    const result = clearSessionState('non-existent-session-xyz');
+    expect(result).toBe(false);
+  });
+
+  it('should return false for invalid session ID', () => {
+    expect(clearSessionState('../../../etc')).toBe(false);
+  });
+});
+
+describe('updateSessionState', () => {
+  const testSessionId = 'test-update-session';
+
+  afterEach(() => {
+    try {
+      clearSessionState(testSessionId);
+    } catch {
+      // Ignore cleanup errors
+    }
+  });
+
+  it('should create new state if none exists', () => {
+    const state = updateSessionState(testSessionId, { loadCount: 1 });
+
+    expect(state.firstLoad).toBeDefined();
+    expect(state.loadCount).toBe(1);
+  });
+
+  it('should merge updates with existing state', () => {
+    saveSessionState(testSessionId, {
+      firstLoad: '2025-01-01T00:00:00.000Z',
+      loadCount: 5,
+      lastPrompt: 'old prompt'
+    });
+
+    const state = updateSessionState(testSessionId, {
+      loadCount: 6,
+      lastPrompt: 'new prompt'
+    });
+
+    expect(state.firstLoad).toBe('2025-01-01T00:00:00.000Z');
+    expect(state.loadCount).toBe(6);
+    expect(state.lastPrompt).toBe('new prompt');
+  });
+});
+
+describe('incrementSessionLoad', () => {
+  const testSessionId = 'test-increment-session';
+
+  afterEach(() => {
+    try {
+      clearSessionState(testSessionId);
+    } catch {
+      // Ignore cleanup errors
+    }
+  });
+
+  it('should create new state on first load', () => {
+    const result = incrementSessionLoad(testSessionId, 'first prompt');
+
+    expect(result.isFirstPrompt).toBe(true);
+    expect(result.state.loadCount).toBe(1);
+    expect(result.state.lastPrompt).toBe('first prompt');
+  });
+
+  it('should increment load count on subsequent loads', () => {
+    incrementSessionLoad(testSessionId, 'first prompt');
+    const result = incrementSessionLoad(testSessionId, 'second prompt');
+
+    expect(result.isFirstPrompt).toBe(false);
+    expect(result.state.loadCount).toBe(2);
+    expect(result.state.lastPrompt).toBe('second prompt');
+  });
+
+  it('should preserve prompt when not provided', () => {
+    incrementSessionLoad(testSessionId, 'first prompt');
+    const result = incrementSessionLoad(testSessionId);
+
+    expect(result.state.lastPrompt).toBe('first prompt');
+  });
+});
+
+describe('SessionStateService class', () => {
+  const testSessionId = 'test-service-class-session';
+  let service: SessionStateService;
+
+  beforeEach(() => {
+    service = new SessionStateService();
+  });
+
+  afterEach(() => {
+    try {
+      service.clear(testSessionId);
+    } catch {
+      // Ignore cleanup errors
+    }
+  });
+
+  it('should provide object-oriented interface', () => {
+    const result = service.incrementLoad(testSessionId, 'test prompt');
+
+    expect(result.isFirstPrompt).toBe(true);
+    expect(service.getLoadCount(testSessionId)).toBe(1);
+    expect(service.isFirstLoad(testSessionId)).toBe(false);
+  });
+
+  it('should support update method', () => {
+    service.save(testSessionId, {
+      firstLoad: new Date().toISOString(),
+      loadCount: 1
+    });
+
+    const state = service.update(testSessionId, { activeMode: 'write' });
+    expect(state.activeMode).toBe('write');
+    expect(state.loadCount).toBe(1);
+  });
+});

ccw/tests/user-abort-detector.test.ts

@@ -0,0 +1,228 @@
+/**
+ * Tests for UserAbortDetector
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  isUserAbort,
+  getMatchingAbortPattern,
+  getAllMatchingAbortPatterns,
+  shouldAllowContinuation,
+  USER_ABORT_EXACT_PATTERNS,
+  USER_ABORT_SUBSTRING_PATTERNS
+} from '../src/core/hooks/user-abort-detector.js';
+import type { StopContext } from '../src/core/hooks/context-limit-detector.js';
+
+describe('isUserAbort', () => {
+  describe('user_requested flag', () => {
+    it('should detect user_requested true (snake_case)', () => {
+      const context: StopContext = { user_requested: true };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect userRequested true (camelCase)', () => {
+      const context: StopContext = { userRequested: true };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should not treat user_requested false as abort', () => {
+      const context: StopContext = { user_requested: false };
+      expect(isUserAbort(context)).toBe(false);
+    });
+  });
+
+  describe('exact patterns', () => {
+    it('should detect "aborted" exactly', () => {
+      const context: StopContext = { stop_reason: 'aborted' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect "abort" exactly', () => {
+      const context: StopContext = { stop_reason: 'abort' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect "cancel" exactly', () => {
+      const context: StopContext = { stop_reason: 'cancel' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect "interrupt" exactly', () => {
+      const context: StopContext = { stop_reason: 'interrupt' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should NOT detect exact patterns as substrings', () => {
+      // This tests that "cancel" doesn't match "cancelled_order"
+      const context: StopContext = { stop_reason: 'cancelled_order' };
+      expect(isUserAbort(context)).toBe(false);
+    });
+
+    it('should NOT detect "abort" in "aborted_request"', () => {
+      // This tests exact match behavior
+      const context: StopContext = { stop_reason: 'aborted_request' };
+      expect(isUserAbort(context)).toBe(false);
+    });
+  });
+
+  describe('substring patterns', () => {
+    it('should detect "user_cancel"', () => {
+      const context: StopContext = { stop_reason: 'user_cancel' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect "user_interrupt"', () => {
+      const context: StopContext = { stop_reason: 'user_interrupt' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect "ctrl_c"', () => {
+      const context: StopContext = { stop_reason: 'ctrl_c' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect "manual_stop"', () => {
+      const context: StopContext = { stop_reason: 'manual_stop' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+
+    it('should detect substring patterns within larger strings', () => {
+      const context: StopContext = { stop_reason: 'user_cancelled_by_client' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+  });
+
+  describe('camelCase support', () => {
+    it('should detect patterns in stopReason (camelCase)', () => {
+      const context: StopContext = { stopReason: 'user_cancel' };
+      expect(isUserAbort(context)).toBe(true);
+    });
+  });
+
+  describe('case insensitivity', () => {
+    it('should be case-insensitive', () => {
+      const contexts: StopContext[] = [
+        { stop_reason: 'ABORTED' },
+        { stop_reason: 'Abort' },
+        { stop_reason: 'USER_CANCEL' },
+        { stop_reason: 'User_Interrupt' }
+      ];
+
+      contexts.forEach(context => {
+        expect(isUserAbort(context)).toBe(true);
+      });
+    });
+  });
+
+  describe('non-abort cases', () => {
+    it('should return false for undefined context', () => {
+      expect(isUserAbort(undefined)).toBe(false);
+    });
+
+    it('should return false for empty reason', () => {
+      const context: StopContext = { stop_reason: '' };
+      expect(isUserAbort(context)).toBe(false);
+    });
+
+    it('should return false for non-abort reasons', () => {
+      const contexts: StopContext[] = [
+        { stop_reason: 'end_turn' },
+        { stop_reason: 'complete' },
+        { stop_reason: 'context_limit' },
+        { stop_reason: 'max_tokens' }
+      ];
+
+      contexts.forEach(context => {
+        expect(isUserAbort(context)).toBe(false);
+      });
+    });
+  });
+});
+
+describe('getMatchingAbortPattern', () => {
+  it('should return null for undefined context', () => {
+    expect(getMatchingAbortPattern(undefined)).toBeNull();
+  });
+
+  it('should return "user_requested" for user_requested flag', () => {
+    const context: StopContext = { user_requested: true };
+    expect(getMatchingAbortPattern(context)).toBe('user_requested');
+  });
+
+  it('should return the exact matching pattern', () => {
+    const context: StopContext = { stop_reason: 'cancel' };
+    expect(getMatchingAbortPattern(context)).toBe('cancel');
+  });
+
+  it('should return the substring matching pattern', () => {
+    const context: StopContext = { stop_reason: 'user_cancel' };
+    expect(getMatchingAbortPattern(context)).toBe('user_cancel');
+  });
+
+  it('should return null when no pattern matches', () => {
+    const context: StopContext = { stop_reason: 'complete' };
+    expect(getMatchingAbortPattern(context)).toBeNull();
+  });
+});
+
+describe('getAllMatchingAbortPatterns', () => {
+  it('should return empty array for undefined context', () => {
+    expect(getAllMatchingAbortPatterns(undefined)).toEqual([]);
+  });
+
+  it('should return all matching patterns', () => {
+    const context: StopContext = {
+      user_requested: true,
+      stop_reason: 'user_cancel'
+    };
+    const patterns = getAllMatchingAbortPatterns(context);
+
+    expect(patterns).toContain('user_requested');
+    expect(patterns).toContain('user_cancel');
+  });
+
+  it('should deduplicate patterns', () => {
+    const context: StopContext = { stop_reason: 'cancel' };
+    const patterns = getAllMatchingAbortPatterns(context);
+
+    // Should only have one 'cancel' entry
+    expect(patterns.filter(p => p === 'cancel')).toHaveLength(1);
+  });
+});
+
+describe('shouldAllowContinuation', () => {
+  it('should return true for undefined context', () => {
+    expect(shouldAllowContinuation(undefined)).toBe(true);
+  });
+
+  it('should return true for non-abort context', () => {
+    const context: StopContext = { stop_reason: 'complete' };
+    expect(shouldAllowContinuation(context)).toBe(true);
+  });
+
+  it('should return false for user abort', () => {
+    const context: StopContext = { user_requested: true };
+    expect(shouldAllowContinuation(context)).toBe(false);
+  });
+
+  it('should return false for cancel reason', () => {
+    const context: StopContext = { stop_reason: 'cancel' };
+    expect(shouldAllowContinuation(context)).toBe(false);
+  });
+});
+
+describe('pattern exports', () => {
+  it('should export exact patterns', () => {
+    expect(USER_ABORT_EXACT_PATTERNS).toContain('aborted');
+    expect(USER_ABORT_EXACT_PATTERNS).toContain('abort');
+    expect(USER_ABORT_EXACT_PATTERNS).toContain('cancel');
+    expect(USER_ABORT_EXACT_PATTERNS).toContain('interrupt');
+  });
+
+  it('should export substring patterns', () => {
+    expect(USER_ABORT_SUBSTRING_PATTERNS).toContain('user_cancel');
+    expect(USER_ABORT_SUBSTRING_PATTERNS).toContain('user_interrupt');
+    expect(USER_ABORT_SUBSTRING_PATTERNS).toContain('ctrl_c');
+    expect(USER_ABORT_SUBSTRING_PATTERNS).toContain('manual_stop');
+  });
+});