chore(gitignore): ignore .codex/ agent local configs (#147)

Co-authored-by: Contentrain <mcp@contentrain.io>

Author: ABB65

.gitignore

@@ -31,6 +31,7 @@ logs
 # Agent local configs (per-user, not shared)
 .claude/
 .windsurf/
+.codex/
 
 # Local env files
 .env