{"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-5dmmfqsi","versions":[{"created_at":"2026-06-14T22:48:03Z","element_count":214,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 南面吹抜 / 北側坪庭 / 高窓採光 / 断熱等級6対応","saved_by":"mcp:create","sha256":"","version":1}]}