{"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-v5wi2ro9","versions":[{"created_at":"2026-06-10T13:32:28Z","element_count":65,"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":"ab2c89afec6a251d656ebe401f421945e00f83c442481f3bdacf0e96d21caeed","version":7},{"created_at":"2026-06-10T12:16:04Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"49668ff52ca6ef66092a255507e387fe3653106aa9dec5fbfefa5beae57c2931","version":3}]}