{"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-0cqlx4gi","versions":[{"created_at":"2026-07-26T09:23:37Z","element_count":238,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 高断熱 / 多雪対策屋根 / 南面最大化","saved_by":"mcp:create","sha256":"","version":1}]}