{"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-td7lckf5","versions":[{"created_at":"2026-06-29T20:50:57Z","element_count":130,"note":"言葉から生成: 総2階(箱) / 書斎とライブラリのある静かな家 / 吹抜け付き中央書斎 / 北側採光 shaft / 雪下ろし易い45度屋根 / 断熱・気密高仕様","saved_by":"mcp:create","sha256":"","version":1}]}