{"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-v7o7yv5g","versions":[{"created_at":"2026-06-10T13:12:37Z","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":"02f39912cfb5b903e13f0f0745e722a954c04285e8435a358e7affc63c650f91","version":11},{"created_at":"2026-06-10T08:48:40Z","element_count":91,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7a7d66ccb9c7226ae547acbf655adb9c2fb359fe5af92b1158b74f3c1e7a8519","version":3}]}