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refactor
Deterministic refactor workflow with tests as the safety net — analyze → plan → refactor → run-tests → fix-tests → comparison. The workflow will not exit until tests pass, guaranteeing behavior preservation. Use when the user asks to "refactor", "restructure", "reorganize", "clean up", "extract", "rename across files", or "modernize" existing code that has test coverage. Worth the ceremony when — the refactor spans multiple files, behavior must be preserved exactly, test coverage exists to prove nothing broke, or the user explicitly wants a safety-netted transformation. Do NOT use for renaming a single variable or function in one file (just do it — the workflow overhead isn't worth it). Do NOT use for adding new behavior (use feature) or fixing broken behavior (use bugfix). Do NOT use when there are no tests — the safety net is the entire point; without tests, do the refactor manually with careful review. If the user wants refactoring advice or a discussion (not the transformation), answer directly instead of
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