{"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-ufr6s6bb","versions":[{"created_at":"2026-06-16T20:07:45Z","element_count":224,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 吹抜(間口4.0m x 高さ5.9m) / 坪庭(4.5㎡ x 2) / 雪対策(屋根勾配45度) / 断熱等級4相当 / 間口11.2mの吹抜け空間","saved_by":"mcp:create","sha256":"","version":1}]}