{"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-epvxqtl5","versions":[{"created_at":"2026-08-18T07:13:46Z","element_count":255,"note":"言葉から生成: L字 / ピアノ室と防音・吹抜のある家 / 吹抜 / 防音ルーム / 中庭 / 断熱等級4","saved_by":"mcp:create","sha256":"","version":1}]}