{"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-0erx94gt","versions":[{"created_at":"2026-06-10T13:15:44Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.0㎡(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":"34ffa812e40f1c7d47cbb5c8903309668eedd3335efba4488d0bbbd0375ae337","version":10},{"created_at":"2026-06-10T09:37:59Z","element_count":88,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"662791bcc5158cf0466c60fb2df17088cd573a141aae0ad88d7df364b458add3","version":2}]}