feat: Implement Cross-CLI Sync Panel for MCP servers

- Added CrossCliSyncPanel component for synchronizing MCP servers between Claude and Codex.
- Implemented server selection, copy operations, and result handling.
- Added tests for path mapping on Windows drives.
- Created E2E tests for ask_question Answer Broker functionality.
- Introduced MCP Tools Test Script for validating modified read_file and edit_file tools.
- Updated path_mapper to ensure correct drive formatting on Windows.
- Added .gitignore for ace-tool directory.

codex-lens/tests/test_path_mapper_windows_drive.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+import platform
+from pathlib import Path
+
+from codexlens.storage.path_mapper import PathMapper
+
+
+def test_denormalize_path_windows_drive_is_absolute() -> None:
+    if platform.system() != "Windows":
+        return
+
+    mapper = PathMapper(index_root=Path("C:/tmp/codexlens_indexes"))
+    mapped = mapper.denormalize_path("D/Claude_dms3/codex-lens/src")
+
+    assert mapped.is_absolute()
+    assert str(mapped).lower().startswith("d:\\") or str(mapped).lower().startswith("d:/")
+    assert mapped == Path("D:/Claude_dms3/codex-lens/src")
+