{"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-willowbrookhouse-uozyvh2x","versions":[{"created_at":"2026-06-10T13:22:50Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"b46f2cfb2491e24d6ef3c183cf50f40b1fefabc2404519bf89a66d8133143e70","version":10},{"created_at":"2026-06-10T10:37:47Z","element_count":89,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"03e5ba94dab5937c259b0106cc30f97a32098b0a48ebb3fc2cd9fc99cc0e3a57","version":2}]}