{"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-5bgjxzlo","versions":[{"created_at":"2026-06-10T13:13:01Z","element_count":62,"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":"9d1f7971558abaeb8c1cab0093a0c37cdd43cac025de547bfbf0ddf24b93b63b","version":11},{"created_at":"2026-06-10T08:48:59Z","element_count":91,"note":"5軸GA polish 46->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d807bbead7f35d882f1b0f35df97b1aa3bf181f6ff49c42174d9abc1c49be4cf","version":3}]}