Document-Driven Development (DD)

A workflow that maintains two kinds of documents with distinct roles:

• Spec（规格）: Temporary, task-bound. Guides AI implementation with precise acceptance criteria. Created before development, archived after.
• Doc（文档）: Permanent, module-bound. Describes system as-is — architecture, rationale, business logic. The living knowledge base for both AI and human architects.

The lifecycle forms a closed loop:

Doc(理解现状) → Spec(定义变更) → Dev(plan + 实现) → Sync(更新文档 + 一致性检查) → Doc'(新的现状)
                                       ↑ small changes skip here

Command Routing

Parse the first argument after /dd: