Function moe_topk_sqrtsoftplus 

pub fn moe_topk_sqrtsoftplus(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    gate_logits: DevicePtr,
    bias: DevicePtr,
    expert_indices: DevicePtr,
    expert_weights: DevicePtr,
    num_experts: u32,
    top_k: u32,
    normalize: bool,
    scaling_factor: f32,
    stream: u64,
) -> Result<()>

2026-09-25: Sqrt-softplus router (sqrt(log(1 + exp(logit)))), one token. As in moe_topk_sigmoid, the bias steers selection only and the weights come from the pre-bias scores.