{"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-willowbrookhouse-qptey35p","versions":[{"created_at":"2026-06-10T13:23:10Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"e355969335ed0eb518cbd593696a4e9303bfdc838a15be8709a6e3912867bc57","version":10},{"created_at":"2026-06-10T10:37:48Z","element_count":91,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ec328d5f74d2cf71468a4d04315ee170785b19fe8e28e4ecf9e62356549065b2","version":2}]}