{"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-vf9lrgss","versions":[{"created_at":"2026-07-02T23:09:30Z","element_count":261,"note":"言葉から生成: L字 / 狭小の町家・吹抜・坪庭 / 吹抜け / 坪庭 / 南面大開口","saved_by":"mcp:create","sha256":"","version":1}]}