{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-5bqond9s","versions":[{"created_at":"2026-06-10T07:25:32Z","element_count":89,"note":"5軸GA polish 52->98 by M5 (autonomous)","saved_by":"mcp","sha256":"6ee6425b5a228134eef6921f3f69567bada622fd3efcb9d6ed053f7fdd2f93af","version":2}]}