{"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-8ikeq5wj","versions":[{"created_at":"2026-07-20T01:54:31Z","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 / 2Fロフト / LDK吹抜 / 南面大開口 / 断熱等級4 / 高断熱サッシュ","saved_by":"mcp:create","sha256":"","version":1}]}