{"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-2et6axmd","versions":[{"created_at":"2026-06-10T13:12:47Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"d644fde2885decc44afb827cdaebdf59663253f1c60374de245be308adde0d1f","version":11},{"created_at":"2026-06-10T08:48:58Z","element_count":91,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ea79c6a84b92ae09cd781504da55495dea45cf845113bc3137c60427364a8c4b","version":3}]}