{"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-xnekbe33","versions":[{"created_at":"2026-06-17T11:15:27Z","element_count":139,"note":"言葉から生成: 平屋(矩形) / 平屋の別荘・大きな軒・土間 / 吹取り屋根(軒出5m) / 半室外土間(50㎡) / 南面全面ガラス / 横断換気 / 耐風設計","saved_by":"mcp:create","sha256":"","version":1}]}