{"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-kirfh0ro","versions":[{"created_at":"2026-06-10T13:12:58Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(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":"d6c6cae0450cfdd761a27e6003c4c1d214739c83d129c4122a6810db71992268","version":11},{"created_at":"2026-06-10T08:48:35Z","element_count":74,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ec35e8a370e4d912f61ec5d51323f3ab73140e0e46115f310314c34eb67e56ca","version":3}]}