{"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-dxn89uw1","versions":[{"created_at":"2026-07-15T12:04:02Z","element_count":126,"note":"言葉から生成: 平屋(矩形) / 平屋の別荘・大きな軒・土間 / 吹き出し土間 / 3.0m超の深い軒 / 南面採光 / 開放的プラン","saved_by":"mcp:create","sha256":"","version":1}]}