Function conv1d_fwd 

pub fn conv1d_fwd(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight: &DenseWeight,
    output: DevicePtr,
    batch: u32,
    dim: u32,
    seq_len: u32,
    d_conv: u32,
    stream: u64,
) -> Result<()>

2026-09-25: Causal depthwise conv1d followed by SiLU over a full sequence (kernel causal_conv1d_fwd), launched without a bias. Input [batch, dim, seq_len] BF16 (channel-first), weight [dim, d_conv] BF16, output [batch, dim, seq_len] BF16.