chore: ignore Claude Code local files

.claude is a symlink to .agents/, so Claude Code's personal settings
and temporary worktrees land under .agents/. Ignore those paths while
keeping shared settings and skills trackable.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -46,3 +46,7 @@ Thumbs.db
 
 # Auto-generated i18n files
 /src/app/i18n-registry.ts
+
+# Claude Code local files (.claude is a symlink to .agents/)
+.agents/settings.local.json
+.agents/worktrees/