chore: add .agents/ and .codex/ to .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jwm4

.gitignore

@@ -83,3 +83,7 @@ docs/_site/
 
 # Claude
 .claude/settings.local.json
+
+# Other AI agent tooling
+.agents/
+.codex/