{"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-121viy1p","versions":[{"created_at":"2026-06-10T13:13:59Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"42953ddb9d392a8e7e67cec89ccfb88678d3f8f3fa6411994638b80566ac7043","version":10},{"created_at":"2026-06-10T09:05:23Z","element_count":72,"note":"5軸GA polish 50->97 by M5 (autonomous)","saved_by":"mcp","sha256":"e8a32107e3b4aaef04e347dcb734bb9b6e4cef2bc1c538019821996d84a90ea5","version":2}]}