{"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-sunsetridgehouse-qx82ylub","versions":[{"created_at":"2026-06-10T13:23:30Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"0663597ee031c4420ceb22402a069e92f1d492d170c89c44675ae6a33a5c7838","version":10},{"created_at":"2026-06-10T10:37:44Z","element_count":84,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"82f76e77b11410bc0b874d1ef1a9bb6e898cafeb8077e4b18dca3a626bd15475","version":2}]}