{"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-58xpc1kl","versions":[{"created_at":"2026-07-31T06:47:20Z","element_count":177,"note":"言葉から生成: 総2階(箱) / ロフト付きワンルーム・吹抜・大開口 / 吹抜 / ロフト / 大開口 / 高気密高断熱","saved_by":"mcp:create","sha256":"","version":1}]}