{"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-lymtwwjd","versions":[{"created_at":"2026-06-12T22:56:43Z","element_count":108,"note":"言葉から生成: 平屋(矩形) / 平屋の別荘・大きな軒・土間","saved_by":"mcp:create","sha256":"","version":1}]}