{"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-d9clzqe5","versions":[{"created_at":"2026-08-17T18:55:41Z","element_count":131,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 高断熱仕様(UA≦0.47) /  daylighting_optimizer /  passive_solar_system","saved_by":"mcp:create","sha256":"","version":1}]}