{"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-6rf438mx","versions":[{"created_at":"2026-06-10T13:19:06Z","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":"157dc205a170e584d5e493420dc8772795e056267a0655a850828ad676647de6","version":10},{"created_at":"2026-06-10T10:09:14Z","element_count":89,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d5945f91ce7bde9239b47e8839acbc84745ee4830c2022a4b2b3aee4dd1ce5ec","version":2}]}