{"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-mlwi0glf","versions":[{"created_at":"2026-06-10T14:13:14Z","element_count":90,"note":"5軸GA polish 66->98 by M5 (autonomous)","saved_by":"mcp","sha256":"0921682b3aedc702fe36a8f63dd6444bca96644f6692fefb4127a53d491720a4","version":7},{"created_at":"2026-06-10T13:47:25Z","element_count":54,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"29b4f2f2a3e21f436a19e5900002e9ddf83d51a5460edccb1cc6d7f18a2675de","version":4}]}