{"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-barnetgreenbungalow-91ddpafc","versions":[{"created_at":"2026-06-10T13:22:14Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"24a714de9f9b26ce769e9b728d56bbb04c9b58f855178d541df230f33c711ae6","version":10},{"created_at":"2026-06-10T10:23:25Z","element_count":74,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"13c7fa51f7f8fc9ac8f62fe201b5ef09820d4d8a9f1e8b837a9d706a9e7e8d06","version":2}]}