{"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-6ip61etc","versions":[{"created_at":"2026-07-03T10:25:09Z","element_count":106,"note":"言葉から生成: 平屋(矩形) / 平屋の別荘・大きな軒・土間 / 吹抜 / 土間 / 深さ1.5mの軒 / 掃き出し窓","saved_by":"mcp:create","sha256":"","version":1}]}