런처 색인 과부하와 AX Agent 리사이즈 재렌더 부담 완화

- 런처 색인에서 .git, node_modules, bin, obj, dist, packages, venv, __pycache__, target 경로를 스캔/감시 제외해 유휴 CPU와 재색인 부담을 줄임

- 런처 재귀 파일 스캔을 제외 폴더 인지형 순회로 바꾸고 무지개 글로우 타이머 주기를 낮춰 visible 상태 UI 갱신 비용을 완화함

- AX Agent는 SizeChanged 때마다 전체 RenderMessages를 즉시 호출하지 않고 디바운스 후 한 번만 반영하도록 바꿔 창 조작 시 무거운 느낌을 줄임

- README와 DEVELOPMENT 문서를 2026-04-06 18:46 (KST) 기준으로 갱신하고 Release 빌드에서 경고 0 / 오류 0을 확인함

docs/DEVELOPMENT.md

@@ -1,5 +1,8 @@
 # AX Copilot - 媛쒕컻 臾몄꽌
 
+- Document update: 2026-04-06 18:46 (KST) - Tightened launcher indexing for real-world projects by ignoring `.git`, `.vs`, `node_modules`, `bin`, `obj`, `dist`, `packages`, `venv`, `__pycache__`, and `target` directories during both watcher handling and full scans. The launcher now skips noisy build/cache trees instead of reacting to them like searchable content.
+- Document update: 2026-04-06 18:46 (KST) - Replaced the launcher's recursive `EnumerateFiles(..., AllDirectories)` walk with an ignore-aware manual traversal so large repos avoid descending into dependency and build folders, and slowed the rainbow glow timer from `20ms` to `40ms`.
+- Document update: 2026-04-06 18:46 (KST) - Added a deferred responsive-layout timer to `ChatWindow` so AX Agent no longer calls `RenderMessages()` on every `SizeChanged` event. Resizing and layout changes are now coalesced into a single update after a short delay, reducing the heavy-window feel during agent-window manipulation.
 - Document update: 2026-04-06 15:31 (KST) - Removed the visible outer border from the Cowork/Code footer permission selector so it reads as a flatter inline action in the bottom work bar.
 - Document update: 2026-04-06 15:26 (KST) - Reworked bottom guidance copy for Chat/Cowork/Code around the actual AX Agent behavior. Input watermark text now comes from a shared helper that considers the active tab and whether a work folder is selected, instead of using overly broad static text.
 - Document update: 2026-04-06 15:26 (KST) - Adjusted the selected preset guide so it prefers concise preset descriptions over raw placeholder prompts, keeping the footer guide and the composer watermark in distinct roles.