{"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-92qoe4w7","versions":[{"created_at":"2026-07-23T13:28:27Z","element_count":175,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 2階吹抜け / 中央坪庭 / 省エネデザイン","saved_by":"mcp:create","sha256":"","version":1}]}