描述
Turn a cleanup packet into one behavior-preserving refactor brief. Use when the user needs to simplify a messy function, component, service, script, or module; split an oversized diff into safer cleanup slices; freeze behavior before touching fragile legacy code; or plan a repeated migration / codemod without changing intended behavior. Route diagnosis to `debugging`, review judgment to `code-review`, validation-program design to `testing-strategies`, bottleneck-led tuning to `performance-optimization`, and pure symbol inventory or impact mapping to `codebase-search`.