chore: update .gitignore

- Add workspace file exclusion
- Add AI agents directory exclusion

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -4,7 +4,7 @@
 *.swp
 *.swo
 *~
-
+CargoTrace.code-workspace
 # OS
 .DS_Store
 Thumbs.db
@@ -13,3 +13,7 @@ Thumbs.db
 *.log
 .env
 .env.local
+
+# AI Agents
+.claude/
+