{"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-v4a37e4b","versions":[{"created_at":"2026-07-20T13:54:49Z","element_count":208,"note":"言葉から生成: 中庭ロの字 / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 雪除け庇 / 高断熱","saved_by":"mcp:create","sha256":"","version":1}]}