feat: Implement CCW Coordinator for interactive command orchestration

- Add action files for session management, command selection, building, execution, and completion.
- Introduce orchestrator logic to drive state transitions and action selection.
- Create state schema to define session state structure.
- Develop command registry and validation tools for command metadata extraction and chain validation.
- Establish skill configuration and specifications for command library and validation rules.
- Implement tools for command registry and chain validation with CLI support.

.claude/skills/ccw-coordinator/README.md

@@ -0,0 +1,45 @@
+# CCW Coordinator
+
+交互式命令编排工具
+
+## 使用
+
+```
+/ccw-coordinator
+或
+/coordinator
+```
+
+## 流程
+
+1. 用户描述任务
+2. Claude推荐命令链
+3. 用户确认或调整
+4. 执行命令链
+5. 生成报告
+
+## 示例
+
+**Bug修复**
+```
+任务: 修复登录bug
+推荐: lite-fix → test-cycle-execute
+```
+
+**新功能**
+```
+任务: 实现注册功能
+推荐: plan → execute → test-cycle-execute
+```
+
+## 文件说明
+
+| 文件 | 用途 |
+|------|------|
+| SKILL.md | Skill入口 |
+| phases/orchestrator.md | 编排逻辑 |
+| phases/state-schema.md | 状态定义 |
+| phases/actions/*.md | 动作实现 |
+| specs/chain-registry.json | 命令元数据 |
+| specs/chain-validation-rules.md | 验证规则 |
+| tools/chain-validate.js | 验证工具 |