{"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-hxn196no","versions":[{"created_at":"2026-06-12T17:18:45Z","element_count":94,"note":"言葉から生成: 平屋(矩形) / ロフト付きワンルーム・吹抜・大開口","saved_by":"mcp:create","sha256":"","version":1}]}