{"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-lqyk0t57","versions":[{"created_at":"2026-06-10T13:15:47Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積92.5㎡(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":"1d9a1be1afd03a1ad33c31335d8f50d77b168e3c5b367108f4496629318d7fe1","version":10},{"created_at":"2026-06-10T09:38:04Z","element_count":91,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d81a74550e40661fcf90696958a370ed457314bf61e3a36fd50dd3abfcefde99","version":2}]}