Test-first refactoring — audit coverage, add characterization tests, apply changes with safety net, run quality stack and review loop. TRIGGER when: user wants to restructure existing Python code without changing behaviour; phrases: \"refactor X\", \"clean up Y\", \"extract Z\", \"restructure this m
Test-first refactoring — audit coverage, add characterization tests, apply changes with safety net, run quality stack and review loop. TRIGGER when: user wants to restructure existing Python code without changing behaviour; phrases: \"refactor X\", \"clean up Y\", \"extract Z\", \"restructure this module\", \"improve code quality\". SKIP when: bug fixes (use `/develop:fix`); new features (use `/de