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/brainstorm/subject-matter-expert.md

@@ -27,10 +27,10 @@ allowed-tools: Task(conceptual-planning-agent), TodoWrite(*), Read(*), Write(*)
 ### Phase 1: Session & Framework Detection
 ```bash
 # Check active session and framework
-CHECK: .workflow/.active-* marker files
+CHECK: find .workflow/sessions/ -name "WFS-*" -type d
 IF active_session EXISTS:
     session_id = get_active_session()
-    brainstorm_dir = .workflow/WFS-{session}/.brainstorming/
+    brainstorm_dir = .workflow/sessions/WFS-{session}/.brainstorming/
 
     CHECK: brainstorm_dir/guidance-specification.md
     IF EXISTS:
@@ -67,13 +67,13 @@ Execute subject-matter-expert analysis for existing topic framework
 
 ## Context Loading
 ASSIGNED_ROLE: subject-matter-expert
-OUTPUT_LOCATION: .workflow/WFS-{session}/.brainstorming/subject-matter-expert/
+OUTPUT_LOCATION: .workflow/sessions/WFS-{session}/.brainstorming/subject-matter-expert/
 ANALYSIS_MODE: {framework_mode ? "framework_based" : "standalone"}
 
 ## Flow Control Steps
 1. **load_topic_framework**
    - Action: Load structured topic discussion framework
-   - Command: Read(.workflow/WFS-{session}/.brainstorming/guidance-specification.md)
+   - Command: Read(.workflow/sessions/WFS-{session}/.brainstorming/guidance-specification.md)
    - Output: topic_framework_content
 
 2. **load_role_template**
@@ -83,7 +83,7 @@ ANALYSIS_MODE: {framework_mode ? "framework_based" : "standalone"}
 
 3. **load_session_metadata**
    - Action: Load session metadata and existing context
-   - Command: Read(.workflow/WFS-{session}/workflow-session.json)
+   - Command: Read(.workflow/sessions/WFS-{session}/workflow-session.json)
    - Output: session_context
 
 ## Analysis Requirements
@@ -143,7 +143,7 @@ TodoWrite({
 
 ### Framework-Based Analysis
 ```
-.workflow/WFS-{session}/.brainstorming/subject-matter-expert/
+.workflow/sessions/WFS-{session}/.brainstorming/subject-matter-expert/
 └── analysis.md    # Structured analysis addressing guidance-specification.md discussion points
 ```
 
@@ -188,7 +188,7 @@ TodoWrite({
   "subject_matter_expert": {
     "status": "completed",
     "framework_addressed": true,
-    "output_location": ".workflow/WFS-{session}/.brainstorming/subject-matter-expert/analysis.md",
+    "output_location": ".workflow/sessions/WFS-{session}/.brainstorming/subject-matter-expert/analysis.md",
     "framework_reference": "@../guidance-specification.md"
   }
 }