feat(skills): add CCW orchestrator and refactor command-guide to ccw-help

CCW Skill (new):
- Stateless workflow orchestrator with intent classification
- 6 workflow combinations: rapid, full, coupled, bugfix, issue, ui
- External configuration: intent-rules.json, workflow-chains.json
- Implicit CLI tool injection (Gemini/Qwen/Codex)
- TODO tracking integration for workflow progress

CCW-Help Skill (refactored from command-guide):
- Renamed command-guide → ccw-help
- Removed reference folder duplication
- Source paths now relative from index/ (../../../commands/...)
- Added all-agents.json index
- Simplified SKILL.md following CCW pattern

.claude/skills/ccw/phases/actions/tdd.md

@@ -0,0 +1,66 @@
+# TDD Workflow Action
+
+## Pattern
+```
+tdd-plan → execute → tdd-verify
+```
+
+## Trigger Conditions
+
+- 关键词: "tdd", "test-driven", "测试驱动", "先写测试", "red-green"
+- 场景: 需要高质量代码保证、关键业务逻辑、回归风险高
+
+## Execution Flow
+
+```mermaid
+graph TD
+    A[User Input] --> B[tdd-plan]
+    B --> C{生成测试任务链}
+    C --> D[Red Phase: 写失败测试]
+    D --> E[execute: 实现代码]
+    E --> F[Green Phase: 测试通过]
+    F --> G{需要重构?}
+    G -->|Yes| H[Refactor Phase]
+    H --> F
+    G -->|No| I[tdd-verify]
+    I --> J[质量报告]
+```
+
+## Configuration
+
+| 参数 | 默认值 | 说明 |
+|------|--------|------|
+| coverage_target | 80% | 目标覆盖率 |
+| cycle_limit | 10 | 最大Red-Green-Refactor循环 |
+| strict_mode | false | 严格模式(必须先红后绿) |
+
+## CLI Integration
+
+| 阶段 | CLI Hint | 用途 |
+|------|----------|------|
+| tdd-plan | `gemini --mode analysis` | 分析测试策略 |
+| execute | `codex --mode write` | 实现代码 |
+| tdd-verify | `gemini --mode analysis` | 验证TDD合规性 |
+
+## Slash Commands
+
+```bash
+/workflow:tdd-plan          # 生成TDD任务链
+/workflow:execute           # 执行Red-Green-Refactor
+/workflow:tdd-verify        # 验证TDD合规性+覆盖率
+```
+
+## When to Use
+
+- 核心业务逻辑开发
+- 需要高测试覆盖率的模块
+- 重构现有代码时确保不破坏功能
+- 团队要求TDD实践
+
+## Risk Assessment
+
+| 风险 | 缓解措施 |
+|------|----------|
+| 测试粒度不当 | tdd-plan阶段评估测试边界 |
+| 过度测试 | 聚焦行为而非实现 |
+| 循环过多 | cycle_limit限制 |