Refactor

Systematic refactoring in atomic named steps: establish a test baseline, identify targets, plan the sequence, execute one technique at a time, and verify tests pass after every step.

Purpose

Improve code structure without changing observable behavior, using a step-by-step plan where each step is a named refactoring technique and every step is verified by tests.

Trigger

Apply when user requests:

• "refactor this", "clean up code", "restructure", "reorganize"
• "improve readability", "reduce complexity", "eliminate duplication"
• "apply design pattern", "extract method", "extract class", "move method"
• "重構", "整理代碼", "消除重複", "改善可讀性", "拆分函式"