chore: gitignore Claude Code local settings

Add .claude/settings.local.json to .gitignore and remove it from
tracking. This file contains machine-specific paths and permissions
that should not be shared across different development environments.

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: 2 people

.claude/settings.local.json

@@ -32,6 +32,9 @@ go.work
 *.swo
 *~
 
+# Claude Code local settings
+.claude/settings.local.json
+
 # OS generated files
 .DS_Store
 .DS_Store?