{"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-71z33lqj","versions":[{"created_at":"2026-06-16T15:22:51Z","element_count":147,"note":"言葉から生成: 総2階(箱) / アトリエ兼住居・北面ハイサイド採光 / 北面ハイサイド採光 / 吹抜け / 断熱等級4 / 2階アトリウム","saved_by":"mcp:create","sha256":"","version":1}]}