Skill: Refactor

What This Skill Does

Enforces safe refactoring discipline: tests green before → refactor with minimal diffs → tests green after → update docs. Prevents the common problem where refactoring introduces subtle regressions because tests weren't run at each step.

When to Use

• When the user wants to restructure, rename, or reorganize code
• When diff-review recommends refactoring
• When tech debt needs to be addressed
• When extract/inline/rename operations span multiple files

Do NOT use this for new features — use implement-phase or scaffold for that.

Execution Model