{"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-p0s9znq3","versions":[{"created_at":"2026-07-19T07:20:13Z","element_count":132,"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 / 防音室 / サッシ断熱 / 雪下ろし簡単","saved_by":"mcp:create","sha256":"","version":1}]}