{"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-whgebu1m","versions":[{"created_at":"2026-06-10T13:14:50Z","element_count":85,"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":"28d69fe6ea73689d2523a349843f3a1b32867303bf5a19b1c0807d376572651a","version":10},{"created_at":"2026-06-10T09:21:47Z","element_count":84,"note":"5軸GA polish 51->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a7e14f09934b9df45b77cc3811e05b5d2115ac1dd30f910af9504d958021207e","version":2}]}