{"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-42cf3b10","versions":[{"created_at":"2026-06-10T13:34:19Z","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":"6c21ddd163d179c20d15f8feb9f4d9decd06fbd1fb73ba078212aa8519a3ab46","version":8},{"created_at":"2026-06-10T12:31:45Z","element_count":69,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"896d29c0b56fce12311c426604a06bbfc6eb4f85d330739104e4d038a5b40092","version":4}]}