Workflow Clean Command Overview Evidence-based intelligent cleanup command. Systematically identifies stale artifacts through mainline analysis, discovers drift, and safely removes unused sessions, documents, and dead code. Core workflow : Detect Mainline → Discover Drift → Confirm → Stage → Execute Target Cleanup Focus area : $FOCUS (or entire project if not specified) Mode : $ARGUMENTS - : Preview cleanup without executing - : Focus area (module or path) Execution Process Implementation Phase 0: Initialization Step 0: Determine Project Root 检测项目根目录，确保 产物位置正确： 优先通过 git 获取仓库根目录；非 git 项目回退到 取当…