v6.1.0: Unify directory structure to storage/specs/, enhance requirements workflow

## Changed
- Directory structure unified: storage/features/ → storage/specs/
- All spec files now use flat naming: {feature}-requirements.md, {feature}-design.md, {feature}-tasks.md
- Follows Article VIII Anti-Abstraction principle

## Enhanced
- Requirements definition workflow (/sdd-requirements):
  - Added Interactive Dialogue Phase: 1-on-1 Q&A to discover 'true purpose'
  - Added MECE Analysis: Comprehensive coverage using 4 dimensions

## Updated
- All .claude/skills/ files (7 files)
- All src/templates/agents/claude-code/skills/ templates (7 files)
- User guides, tutorials, and examples
- bin/musubi-init.js now creates storage/archive/ instead of storage/features/

Author: hisaho

.claude/skills/constitution-enforcer/SKILL.md

@@ -614,4 +614,4 @@ Before finishing:
 - [ ] Failures documented with severity
 - [ ] Remediation plan provided
 - [ ] Overall status determined (APPROVED/BLOCKED)
-- [ ] Report saved to `storage/features/[feature]/constitutional-compliance.md`
+- [ ] Report saved to `storage/specs/[feature]-constitutional-compliance.md`

.claude/skills/constitution-enforcer/phase-minus-one-gates.md

@@ -183,9 +183,9 @@ def validate_traceability_setup(feature_name):
     Verify traceability chain is ready.
     """
     required_artifacts = {
-        "requirements": f"storage/features/{feature_name}/requirements.md",
-        "design": f"storage/features/{feature_name}/design.md",
-        "tasks": f"storage/features/{feature_name}/tasks.md",
+        "requirements": f"storage/specs/{feature_name}-requirements.md",
+        "design": f"storage/specs/{feature_name}-design.md",
+        "tasks": f"storage/specs/{feature_name}-tasks.md",
     }
 
     for artifact, path in required_artifacts.items():

.claude/skills/site-reliability-engineer/SKILL.md

@@ -317,7 +317,7 @@ app.get('/health/live', (req, res) => {
 
 ### Phase 1: SLO Definition (Based on Requirements)
 
-1. Read `storage/features/[feature]/requirements.md`
+1. Read `storage/specs/[feature]-requirements.md`
 2. Identify non-functional requirements (performance, availability)
 3. Define SLIs and SLOs
 4. Calculate error budgets

.claude/skills/steering/auto-update-rules.md

@@ -96,7 +96,7 @@ git diff --name-only | grep -E "(webpack|vite|rollup|esbuild)\.config\."
 **Detection**:
 ```bash
 # New feature directories
-git diff --name-only --diff-filter=A | grep "storage/features/"
+git diff --name-only --diff-filter=A | grep "storage/specs/"
 
 # New requirement files
 git diff --name-only --diff-filter=A | grep "requirements\.md"
@@ -143,7 +143,7 @@ git diff --name-only --diff-filter=A | grep "requirements\.md"
 
 ### memories/architecture_decisions.md
 
-**Trigger**: New ADR created in `storage/features/*/design.md`
+**Trigger**: New ADR created in `storage/specs/*-design.md`
 
 **Action**:
 ```markdown
@@ -219,8 +219,8 @@ diff <(grep "dependencies" steering/tech.md) <(cat package.json | jq '.dependenc
 # 2. Check if structure.md directories match actual structure
 diff <(grep -E "^-\s+" steering/structure.md | cut -d' ' -f2) <(find src -type d -maxdepth 2)
 
-# 3. Check if product.md features match storage/features/
-diff <(grep "Feature" steering/product.md) <(ls storage/features/)
+# 3. Check if product.md features match storage/specs/
+diff <(grep "Feature" steering/product.md) <(ls storage/specs/ | grep requirements)
 ```
 
 ### Report Divergence
@@ -239,7 +239,7 @@ diff <(grep "Feature" steering/product.md) <(ls storage/features/)
 - ⚠️ Removed directory: src/legacy/ (no longer exists)
 
 ### product.md
-- ⚠️ Missing feature: payment-integration (in storage/features/)
+- ⚠️ Missing feature: payment-integration (in storage/specs/)
 
 ## Recommendations
 1. Run steering skill to update all files
@@ -279,7 +279,7 @@ on:
     paths:
       - 'package.json'
       - 'src/**'
-      - 'storage/features/**'
+      - 'storage/specs/**'
 
 jobs:
   check-steering:

.claude/skills/traceability-auditor/SKILL.md

@@ -101,9 +101,9 @@ Test Suite (tests/auth/service.test.ts)
 
 ### Phase 1: Collect Artifacts
 
-1. Read `storage/features/[feature]/requirements.md`
-2. Read `storage/features/[feature]/design.md`
-3. Read `storage/features/[feature]/tasks.md`
+1. Read `storage/specs/[feature]-requirements.md`
+2. Read `storage/specs/[feature]-design.md`
+3. Read `storage/specs/[feature]-tasks.md`
 4. Scan source code for implementation
 5. Scan test files for test cases
 
@@ -290,7 +290,7 @@ coverage_test = (requirements_with_tests / requirements_total) * 100
 - **After**:
   - If gaps found → orchestrator triggers missing skills
   - If complete → quality-assurance approves release
-- **Uses**: All spec files in `storage/features/` and `storage/changes/`
+- **Uses**: All spec files in `storage/specs/` and `storage/changes/`
 
 ## Gap Detection Rules
 

.claude/skills/traceability-auditor/coverage-matrix-template.md

@@ -96,9 +96,9 @@ Template for creating traceability coverage matrices that ensure 100% compliance
 def generate_traceability_matrix(feature_name):
     """Generate traceability matrix for a feature."""
 
-    requirements = parse_requirements(f"storage/features/{feature_name}/requirements.md")
-    design = parse_design(f"storage/features/{feature_name}/design.md")
-    tasks = parse_tasks(f"storage/features/{feature_name}/tasks.md")
+    requirements = parse_requirements(f"storage/specs/{feature_name}-requirements.md")
+    design = parse_design(f"storage/specs/{feature_name}-design.md")
+    tasks = parse_tasks(f"storage/specs/{feature_name}-tasks.md")
     code_files = find_code_files(f"src/{feature_name}/")
     test_files = find_test_files(f"tests/{feature_name}/")
 

.claude/skills/traceability-auditor/gap-detection-rules.md

@@ -89,8 +89,8 @@ for ref in all_references:
 #!/bin/bash
 # find-orphaned-requirements.sh
 
-REQ_FILE="storage/features/$1/requirements.md"
-DESIGN_FILE="storage/features/$1/design.md"
+REQ_FILE="storage/specs/$1-requirements.md"
+DESIGN_FILE="storage/specs/$1-design.md"
 
 # Extract requirement IDs
 grep -oP 'REQ-[\w-]+' "$REQ_FILE" | sort -u > /tmp/reqs.txt
@@ -207,7 +207,7 @@ name: Traceability Check
 on:
   pull_request:
     paths:
-      - 'storage/features/**'
+      - 'storage/specs/**'
       - 'src/**'
       - 'tests/**'