{"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-wmxzq7pw","versions":[{"created_at":"2026-07-15T21:17:01Z","element_count":245,"note":"言葉から生成: L字 / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 雪下ろし易い屋根 / 高断熱高気密 / 採光確保","saved_by":"mcp:create","sha256":"","version":1}]}