对仓库做定向代码探索并把"提问→读代码→得结论"沉淀为可检索证据，三种类型 question / module-overview / spike。触发：用户说"先 explore 一下"、"这个仓库里 X 怎么实现"、"快速熟悉这个模块"、"把探索结果存档"。
Install
The individual skill folder is not confirmed. This command opens the repository’s skill selector; follow the upstream instructions.
skills CLI
npx skills add codestable/CodeStable