chore: Remove .claude/settings.local.json from tracking and add to .gitignore

The .claude/settings.local.json file contains Claude Code-specific permission
settings that are user-specific and should not be committed to the repository.

- Remove .claude/settings.local.json from git tracking
- Add .claude/settings.local.json to .gitignore for clean repo state
- Local file remains for user's Claude Code permissions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -74,3 +74,6 @@ Thumbs.db
 # MarkiTect issue workspace (temporary development files)
 .markitect_workspace/
 
+# Claude Code local settings (user-specific permissions)
+.claude/settings.local.json
+