{"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-grhsy03u","versions":[{"created_at":"2026-06-15T08:24:04Z","element_count":88,"note":"言葉から生成: 平屋(矩形) / ロフト付きワンルーム・吹抜・大開口 / ロフト / 吹抜 / 大開口 / 土間 / 縁側","saved_by":"mcp:create","sha256":"","version":1}]}