docs：更新项目规范文档

- 在 claude.md 添加 Plan Mode Protocol 章节
- 明确规划阶段的输出要求和执行报告流程
- 强制要求在每个 TODO 完成后更新文档并等待用户确认

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

claude.md

@@ -98,3 +98,16 @@ func _move(_delta: float) -> void:
     var dir := Input.get_vector("move_left", "move_right", "move_up", "move_down")
     velocity = dir * move_speed
     move_and_slide()
+``` 
+## 10. 🔄 Plan Mode Protocol (MANDATORY)
+- **Planning Phase**:
+  - Whenever using **Plan Mode** to outline a task, a TODO list MUST be outputted to `docs/ai_docs/plan/[feature_name].md`.
+- **Execution & Reporting**:
+  - Every time a TODO item is completed, the corresponding `.md` document MUST be updated.
+  - After updating the document, report to the user with the following:
+    1. **Completed Items**: What was just finished.
+    2. **User Acceptance Rules**: Instructions on how the user can test/verify the current progress.
+    3. **Next Step**: The next TODO item to be tackled.
+- **Strict Confirmation**:
+  - After reporting progress, **Claude MUST stop and wait**.
+  - Do NOT proceed to the next TODO until the user has replied with confirmation/approval.