{"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-bghp9e59","versions":[{"created_at":"2026-06-10T14:46:19Z","element_count":83,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"76ac8d00eda9ed900c7f271f7b93a8e03dcb00adb6e1b3957b39ea170aacf1d0","version":7}]}