MenuWriter::fail guards wp_delete_post for created items: the touched items are still restored and the client gets partial_write (with previous_items) instead of internal_error. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7