Post-Refactor Clean-Code Sweep

Use this skill after a refactor, cleanup series, or a handful of related PRs landed. It is not a full PR audit and should not re-litigate already merged work. Keep the pass focused on the code that changed recently and on defects that refactors commonly leave behind.

Primary goal: answer, "Did we leave the touched code cleaner, safer, and well covered, or did we leave regressions and cleanup debt behind?"

Scope

Pick the narrowest useful range: