{"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-1n26buz0","versions":[{"created_at":"2026-07-06T00:39:23Z","element_count":187,"note":"言葉から生成: 総2階(箱) / ロフト付きワンルーム・吹抜・大開口 / ロフト空間 / 吹抜け / 南面大開口 / 高断熱・気密施工 / 豪雪地帯対応屋根勾配","saved_by":"mcp:create","sha256":"","version":1}]}