Function silu_mul_strided 

pub fn silu_mul_strided(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    gate: DevicePtr,
    up: DevicePtr,
    output: DevicePtr,
    rows: u32,
    cols: u32,
    in_stride: u32,
    out_stride: u32,
    stream: u64,
) -> Result<()>

2026-09-25: SiLU(gate) * up over row-strided BF16 operands (kernel silu_mul_strided): row r reads gate and up at r * in_stride + c for c < cols and writes output at r * out_stride + c. The fused dense-FFN gate+up projection (layers/dense_ffn_gateup_fused.rs) passes the two column halves of one [rows, 2 * cols] matrix (up = gate.offset(cols * 2)) and a contiguous output. One grid row per matrix row.