{"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-ra8epyrg","versions":[{"created_at":"2026-06-10T13:30:11Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"b3c5c0f90d34ae4124c2329ca0953a05131883d2191a362b1f592af152e22152","version":9},{"created_at":"2026-06-10T11:43:30Z","element_count":73,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"dcc8a1679c4873398097ae49c65424b613a850d8d93e1fd778aa348683ff4812","version":4}]}