AX Agent 코드 메시지 강조와 Git 요약 배너 개선

- Cowork/Code 메시지 마크다운 렌더에 camelCase, PascalCase, snake_case 등 코드 심볼 강조를 추가함

- 코드 탭 입력부 위에 저장소/브랜치/변경 수치 요약 배너를 추가해 claude-code 스타일의 repo context를 빠르게 확인할 수 있게 함

- README와 DEVELOPMENT 문서를 2026-04-06 20:18 (KST) 기준으로 갱신함

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

docs/DEVELOPMENT.md

@@ -5018,3 +5018,5 @@ ow + toggle ?쒓컖 ?몄뼱濡??ㅼ떆 ?뺣젹?덈떎.
 - Document update: 2026-04-06 18:34 (KST) - `SnippetExpander.cs` now short-circuits immediately for normal typing unless snippet tracking is already active or the current key is the `;` trigger. This removes repeated `GetAsyncKeyState` and buffer logic from ordinary typing in other apps and makes the low-level hook substantially lighter under continuous input.
 
 
+업데이트: 2026-04-06 20:18 (KST)
+- Improved AX Agent markdown rendering for Cowork/Code by highlighting file paths plus code-like symbols, and added a compact repository summary banner above the Code composer to surface branch and diff context closer to `claude-code`.