Small, safe refactorings before feature work using Kent Beck's "Tidy First?" patterns (guard clauses, extract helper, move to model, etc.). Invoke as `/cga-tf-refactoring [file]` or use when preparing code for changes, like "tidy this file before adding feature", "refactor before implementing", "clean up structure before modifying", "整理してから機能追加", "リファクタリングしてから変更". NOT for large refactorings or code without tests.