{"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-800msgl6","versions":[{"created_at":"2026-06-15T02:48:36Z","element_count":145,"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","saved_by":"mcp:create","sha256":"","version":1}]}