Function w8a16_gemv_batch16 

pub fn w8a16_gemv_batch16(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight: DevicePtr,
    block_scale: DevicePtr,
    output: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    stream: u64,
) -> Result<()>

2026-09-25: The 16-row instantiation of the same template (kernel w8a16_gemv_batch16, module w8a16_gemv_batch4), with the launch geometry and per-row numerics of w8a16_gemv_batch4.