{"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-h2ukbbky","versions":[{"created_at":"2026-06-18T10:05:30Z","element_count":91,"note":"言葉から生成: 平屋(矩形) / 平屋の別荘・大きな軒・土間 / 庇深さ3.0m / 土間広場 / 高断熱高気密 / 自然換気 / 眺望テラス","saved_by":"mcp:create","sha256":"","version":1}]}