AX Agent footer와 Git 브랜치 프레젠테이션 구조를 분리하고 회귀 점검 루틴을 고정한다

- ChatWindow.FooterPresentation에서 Git 브랜치 팝업 렌더와 요약 helper를 분리해 폴더 바 상태/프리셋 안내 동기화 책임만 남긴다

- ChatWindow.GitBranchPresentation을 추가해 브랜치 팝업 조립, 요약 pill, 최근 브랜치/전환 액션 렌더를 별도 프레젠테이션 계층으로 옮긴다

- AX_AGENT_REGRESSION_PROMPTS 문서를 재작성해 실패 분류와 Chat/Cowork/Code별 필수 회귀 묶음을 개발 루틴으로 고정한다

- 검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\ (경고 0 / 오류 0)

docs/claw-code-parity-plan.md

@@ -14,6 +14,9 @@
 - Progressed the maintainability track by moving runtime strip styling into `OperationalStatusPresentationCatalog.cs`, expanding permission/tool-result transcript catalogs with typed descriptions, and removing the stale plan-mode presentation branch from permission UI surfaces. The next structural focus remains footer/status/composer presentation slimming and regression ritual enforcement.
 - Updated: 2026-04-06 09:44 (KST)
 - Continued the maintainability track by splitting mixed inline interaction rendering into `ChatWindow.UserAskPresentation.cs` and `ChatWindow.PlanApprovalPresentation.cs`. This reduces message-type coupling inside the main window and keeps the next focus on footer/composer presentation and regression-routine formalization.
+- Updated: 2026-04-06 09:58 (KST)
+- Continued the maintainability track by splitting Git branch popup and footer-adjacent summary helpers into `ChatWindow.GitBranchPresentation.cs`, leaving `ChatWindow.FooterPresentation.cs` focused on folder bar state and preset-guide sync only.
+- Formalized the regression ritual in `docs/AX_AGENT_REGRESSION_PROMPTS.md` by adding failure classes (`blank-reply`, `duplicate-banner`, `bad-approval-flow`, `queue-drift`, `restore-drift`, `status-noise`) and required prompt bundles per change area.
 
 ## Preserved History (Summary)
 - Core loop guards and post-tool verification gates are already partially implemented.