Function ensure_decode_route_servable 

pub fn ensure_decode_route_servable(
    route: MoeLoraRoute,
    path: &str,
) -> Result<()>

2026-09-25: An error when route is Refuse. The batched decode entries (model-engine decode_batch_compute_main, mixed_forward) call it before any graph lookup: build_moe_row_adapter_decode writes a Refuse row as -1, so the batch would otherwise run that request without its adapter.