{"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-5r5nzvox","versions":[{"created_at":"2026-07-03T02:26:26Z","element_count":236,"note":"言葉から生成: 総2階(箱) / 茶室と縁側のある和の住まい","saved_by":"mcp:create","sha256":"","version":1}]}