{"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-oan1y2f2","versions":[{"created_at":"2026-06-18T15:35:14Z","element_count":210,"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 / 南面大開口 / 気密・断熱強化","saved_by":"mcp:create","sha256":"","version":1}]}