{"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-p549ar3b","versions":[{"created_at":"2026-08-15T12:21:00Z","element_count":222,"note":"言葉から生成: 中庭ロの字 / 狭小の町家・吹抜・坪庭 / 南面吹抜 / 中庭(坪庭) / 雪庇対策 / 南面最大採光 / 中庭周辺LDK","saved_by":"mcp:create","sha256":"","version":1}]}