维护 `.codestable/requirements/` 下的能力愿景文档。三种模式 draft / backfill / update。触发：design 阶段起草愿景、acceptance 阶段落档，或用户说"刷新 requirements"、"补一份 req"、"先把愿景写下来"。
This skill does not declare a tool allowlist. The agent host applies whatever default tools are available at runtime.
SKILL.md / Manifest
https://raw.githubusercontent.com/liuzhengdongfortest/codestable/main/cs-req/SKILL.mdRegistry
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