{"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-9z3b27f6","versions":[{"created_at":"2026-07-05T01:17:40Z","element_count":254,"note":"言葉から生成: 中庭ロの字 / 狭小の町家・吹抜・坪庭 / 北側吹抜 / 南面ロフテッドテラス / 雪除け庇","saved_by":"mcp:create","sha256":"","version":1}]}