fix(workflow): complete path migration and enhance session:complete

Comprehensive update to eliminate all old path references and implement transactional archival in session:complete.

## Part 1: Complete Path Migration (43 files)

### Files Updated
- action-plan-verify.md
- session/list.md, session/resume.md
- tdd-verify.md, tdd-plan.md, test-*.md
- All brainstorm/*.md files (13 files)
- All tools/*.md files (10 files)
- All ui-design/*.md files (10 files)
- lite-plan.md, lite-execute.md, plan.md

### Path Changes
- `.workflow/.active-*` → `find .workflow/sessions/ -name "WFS-*" -type d`
- `.workflow/WFS-{session}` → `.workflow/sessions/WFS-{session}`
- `.workflow/.archives/` → `.workflow/archives/`
- Removed all marker file operations (touch/rm .active-*)

### Verification
- ✅ 0 references to .active-* markers remain
- ✅ 0 references to direct .workflow/WFS-* paths
- ✅ 0 references to .workflow/.archives/ (dot prefix)

## Part 2: Transactional Archival Enhancement

### session/complete.md - Complete Rewrite

**New Four-Phase Architecture**:

1. **Phase 1: Pre-Archival Preparation**
   - Find active session in .workflow/sessions/
   - Check for existing .archiving marker (resume detection)
   - Create .archiving marker to prevent concurrent operations

2. **Phase 2: Agent Analysis (In-Place)**
   - Agent processes session WHILE STILL in sessions/ directory
   - Pure analysis - no file moves or manifest updates
   - Returns complete metadata package for atomic commit
   - Failure here → session remains active, safe to retry

3. **Phase 3: Atomic Commit**
   - Only executes if Phase 2 succeeds
   - Move session to archives/
   - Update manifest.json
   - Remove .archiving marker
   - All-or-nothing guarantee

4. **Phase 4: Project Registry Update**
   - Extract feature metadata and update project.json

**Key Improvements**:
- **Agent-first, move-second**: Prevents inconsistent states
- **Transactional guarantees**: All-or-nothing file operations
- **Resume capability**: .archiving marker enables safe retry
- **Error recovery**: Comprehensive failure handling documented

**Old Design Flaw (Fixed)**:
- Old: Move first → Agent processes → If agent fails, session moved but metadata incomplete
- New: Agent processes → If success, atomic commit → Guaranteed consistency

## Benefits

1. **Consistency**: All commands use identical path patterns
2. **Robustness**: Transactional archival prevents data loss
3. **Maintainability**: Single source of truth for directory structure
4. **Recoverability**: Failed operations can be safely retried
5. **Alignment**: Closer to OpenSpec's clean three-layer model

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/workflow/session/list.md

@@ -19,35 +19,35 @@ Display all workflow sessions with their current status, progress, and metadata.
 
 ### Step 1: Find All Sessions
 ```bash
-ls .workflow/WFS-* 2>/dev/null
+ls .workflow/sessions/WFS-* 2>/dev/null
 ```
 
 ### Step 2: Check Active Session
 ```bash
-ls .workflow/.active-* 2>/dev/null | head -1
+find .workflow/sessions/ -name "WFS-*" -type d 2>/dev/null | head -1
 ```
 
 ### Step 3: Read Session Metadata
 ```bash
-jq -r '.session_id, .status, .project' .workflow/WFS-session/workflow-session.json
+jq -r '.session_id, .status, .project' .workflow/sessions/WFS-session/workflow-session.json
 ```
 
 ### Step 4: Count Task Progress
 ```bash
-find .workflow/WFS-session/.task/ -name "*.json" -type f 2>/dev/null | wc -l
-find .workflow/WFS-session/.summaries/ -name "*.md" -type f 2>/dev/null | wc -l
+find .workflow/sessions/WFS-session/.task/ -name "*.json" -type f 2>/dev/null | wc -l
+find .workflow/sessions/WFS-session/.summaries/ -name "*.md" -type f 2>/dev/null | wc -l
 ```
 
 ### Step 5: Get Creation Time
 ```bash
-jq -r '.created_at // "unknown"' .workflow/WFS-session/workflow-session.json
+jq -r '.created_at // "unknown"' .workflow/sessions/WFS-session/workflow-session.json
 ```
 
 ## Simple Bash Commands
 
 ### Basic Operations
-- **List sessions**: `find .workflow/ -maxdepth 1 -type d -name "WFS-*"`
-- **Find active**: `find .workflow/ -name ".active-*" -type f`
+- **List sessions**: `find .workflow/sessions/ -name "WFS-*" -type d`
+- **Find active**: `find .workflow/sessions/ -name "WFS-*" -type d`
 - **Read session data**: `jq -r '.session_id, .status' session.json`
 - **Count tasks**: `find .task/ -name "*.json" -type f | wc -l`
 - **Count completed**: `find .summaries/ -name "*.md" -type f 2>/dev/null | wc -l`
@@ -89,11 +89,8 @@ Total: 3 sessions (1 active, 1 paused, 1 completed)
 ### Quick Commands
 ```bash
 # Count all sessions
-ls .workflow/WFS-* | wc -l
-
-# Show only active
-ls .workflow/.active-* | basename | sed 's/^\.active-//'
+ls .workflow/sessions/WFS-* | wc -l
 
 # Show recent sessions
-ls -t .workflow/WFS-*/workflow-session.json | head -3
+ls -t .workflow/sessions/WFS-*/workflow-session.json | head -3
 ```