{"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-z216tkiy","versions":[{"created_at":"2026-07-28T06:02:20Z","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 / 全面庇(軒出1.5m) / 全面土間デッキ / 南面全面窓 / 中庭風テラス","saved_by":"mcp:create","sha256":"","version":1}]}