feat(v6.3.0): SDD document path unification

- Requirements → storage/specs/
- Design documents → storage/design/
- Task documents → storage/tasks/
- Validation reports → storage/validation/

Updated:
- All 7 agent platform templates (Claude Code, GitHub Copilot, Cursor, Gemini CLI, Codex CLI, Qwen Code, Windsurf)
- musubi-init.js: Create storage/design and storage/tasks directories
- Steering files: structure.md, tech.md, product.md (EN/JA)
- Documentation: README, CHANGELOG, USER-GUIDE, QUICKSTART, AGENTS.md

Tests:
- Unit tests: 4,827 passing
- Integration tests: 660 passing

Author: hisaho

.claude/commands/sdd-change-init.md

@@ -57,7 +57,7 @@ grep -r "{{related-feature}}" lib/
 ls storage/specs/*requirements.md
 
 # Check existing design documents
-ls storage/specs/*design.md
+ls storage/design/*design.md
 ```
 
 **Document Current State**:
@@ -334,7 +334,7 @@ Use template from `templates/change-proposal.md`:
 ### References
 
 - Original requirements: `storage/specs/{{feature}}-requirements.md`
-- Current design: `storage/specs/{{feature}}-design.md`
+- Current design: `storage/design/{{feature}}-design.md`
 - Related issues: #123, #456
 
 ### Change History

.claude/commands/sdd-design.md

@@ -531,10 +531,10 @@ Document ADRs for:
 **IMPORTANT**: Create BOTH English and Japanese versions.
 
 **English version (Primary/Reference)**:
-`storage/specs/{{feature-name}}-design.md`
+`storage/design/{{feature-name}}-design.md`
 
 **Japanese version (Translation)**:
-`storage/specs/{{feature-name}}-design.ja.md`
+`storage/design/{{feature-name}}-design.ja.md`
 
 **File Naming**:
 
@@ -545,10 +545,10 @@ Document ADRs for:
 
 **Examples**:
 
-- `storage/specs/authentication-design.md` (English)
-- `storage/specs/authentication-design.ja.md` (Japanese)
-- `storage/specs/payment-processing-design.md` (English)
-- `storage/specs/payment-processing-design.ja.md` (Japanese)
+- `storage/design/authentication-design.md` (English)
+- `storage/design/authentication-design.ja.md` (Japanese)
+- `storage/design/payment-processing-design.md` (English)
+- `storage/design/payment-processing-design.ja.md` (Japanese)
 
 **Generation Order**:
 
@@ -565,7 +565,7 @@ Document ADRs for:
 Run constitutional validation:
 
 ```bash
-@constitution-enforcer validate storage/specs/{{feature-name}}-design.md
+@constitution-enforcer validate storage/design/{{feature-name}}-design.md
 ```
 
 **Checks**:
@@ -584,7 +584,7 @@ Run constitutional validation:
 ## ✅ Technical Design Complete
 
 **Feature**: {{FEATURE_NAME}}
-**File**: storage/specs/{{feature-name}}-design.md
+**File**: storage/design/{{feature-name}}-design.md
 
 ### Architecture Summary:
 

.claude/commands/sdd-implement.md

@@ -32,10 +32,10 @@ Implement the feature by executing tasks from the task breakdown document, follo
 
 ```bash
 # Task Breakdown (English version)
-storage/specs/{{feature-name}}-tasks.md
+storage/tasks/{{feature-name}}-tasks.md
 
 # Design (English version)
-storage/specs/{{feature-name}}-design.md
+storage/design/{{feature-name}}-design.md
 
 # Requirements (English version)
 storage/specs/{{feature-name}}-requirements.md
@@ -57,7 +57,7 @@ steering/product.md
 ```markdown
 ❌ **Error**: Task breakdown not found
 
-Expected: storage/specs/{{feature-name}}-tasks.md
+Expected: storage/tasks/{{feature-name}}-tasks.md
 
 Please run `/sdd-tasks {{feature-name}}` first.
 
@@ -69,7 +69,7 @@ Implementation requires task breakdown.
 ```markdown
 ❌ **Error**: Design document not found
 
-Expected: storage/specs/{{feature-name}}-design.md
+Expected: storage/design/{{feature-name}}-design.md
 
 Implementation requires design document.
 ```

.claude/commands/sdd-tasks.md

@@ -30,7 +30,7 @@ Generate a comprehensive task breakdown that transforms the design into actionab
 
 ```bash
 # Design and Requirements
-storage/specs/{{feature-name}}-design.md
+storage/design/{{feature-name}}-design.md
 storage/specs/{{feature-name}}-requirements.md
 
 # Steering Context
@@ -48,7 +48,7 @@ steering/product.md
 ```markdown
 ❌ **Error**: Design document not found
 
-Expected: storage/specs/{{feature-name}}-design.md
+Expected: storage/design/{{feature-name}}-design.md
 
 Please run `/sdd-design {{feature-name}}` first.
 
@@ -487,10 +487,10 @@ Before marking feature complete, verify:
 **IMPORTANT**: Create BOTH English and Japanese versions.
 
 **English version (Primary/Reference)**:
-`storage/specs/{{feature-name}}-tasks.md`
+`storage/tasks/{{feature-name}}-tasks.md`
 
 **Japanese version (Translation)**:
-`storage/specs/{{feature-name}}-tasks.ja.md`
+`storage/tasks/{{feature-name}}-tasks.ja.md`
 
 **File Naming**:
 - Match requirements and design files
@@ -512,8 +512,8 @@ Before marking feature complete, verify:
 
 **Feature**: {{FEATURE_NAME}}
 **Files**:
-- English: storage/specs/{{feature-name}}-tasks.md
-- Japanese: storage/specs/{{feature-name}}-tasks.ja.md
+- English: storage/tasks/{{feature-name}}-tasks.md
+- Japanese: storage/tasks/{{feature-name}}-tasks.ja.md
 
 ### Summary:
 - **Total Tasks**: [N]
@@ -597,7 +597,7 @@ Before completing:
 ```markdown
 ❌ **Error**: Design document not found
 
-Expected: storage/specs/{{feature-name}}-design.md
+Expected: storage/design/{{feature-name}}-design.md
 
 Please run `/sdd-design {{feature-name}}` first.
 ```

.claude/commands/sdd-validate.md

@@ -37,8 +37,8 @@ Perform comprehensive validation of the feature implementation against:
 ```bash
 # Requirements and Design (English versions)
 storage/specs/{{feature-name}}-requirements.md
-storage/specs/{{feature-name}}-design.md
-storage/specs/{{feature-name}}-tasks.md
+storage/design/{{feature-name}}-design.md
+storage/tasks/{{feature-name}}-tasks.md
 
 # Steering Context (English versions)
 steering/structure.md

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

@@ -184,8 +184,8 @@ def validate_traceability_setup(feature_name):
     """
     required_artifacts = {
         "requirements": f"storage/specs/{feature_name}-requirements.md",
-        "design": f"storage/specs/{feature_name}-design.md",
-        "tasks": f"storage/specs/{feature_name}-tasks.md",
+        "design": f"storage/design/{feature_name}-design.md",
+        "tasks": f"storage/tasks/{feature_name}-tasks.md",
     }
 
     for artifact, path in required_artifacts.items():

.claude/skills/steering/auto-update-rules.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/specs/*-design.md`
+**Trigger**: New ADR created in `storage/design/*-design.md`
 
 **Action**:
 ```markdown

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

@@ -102,8 +102,8 @@ Test Suite (tests/auth/service.test.ts)
 ### Phase 1: Collect Artifacts
 
 1. Read `storage/specs/[feature]-requirements.md`
-2. Read `storage/specs/[feature]-design.md`
-3. Read `storage/specs/[feature]-tasks.md`
+2. Read `storage/design/[feature]-design.md`
+3. Read `storage/tasks/[feature]-tasks.md`
 4. Scan source code for implementation
 5. Scan test files for test cases
 

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

@@ -97,8 +97,8 @@ def generate_traceability_matrix(feature_name):
     """Generate traceability matrix for a feature."""
 
     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")
+    design = parse_design(f"storage/design/{feature_name}-design.md")
+    tasks = parse_tasks(f"storage/tasks/{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

@@ -90,7 +90,7 @@ for ref in all_references:
 # find-orphaned-requirements.sh
 
 REQ_FILE="storage/specs/$1-requirements.md"
-DESIGN_FILE="storage/specs/$1-design.md"
+DESIGN_FILE="storage/design/$1-design.md"
 
 # Extract requirement IDs
 grep -oP 'REQ-[\w-]+' "$REQ_FILE" | sort -u > /tmp/reqs.txt