{"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-dx4gcgqc","versions":[{"created_at":"2026-07-04T20:26:38Z","element_count":208,"note":"言葉から生成: 中庭ロの字 / アトリエ兼住居・北面ハイサイド採光 / 吹抜け / サッシ換気 / 太陽熱利用","saved_by":"mcp:create","sha256":"","version":1}]}