{"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-soamd16c","versions":[{"created_at":"2026-08-17T17:14:30Z","element_count":209,"note":"言葉から生成: 総2階(箱) / ピアノ室と防音・吹抜のある家 / 吹抜 / ピアノ室 / 防音仕様 / 高気密・高断熱 / 雪下ろし考慮","saved_by":"mcp:create","sha256":"","version":1}]}