Function gdn_carry_conv 

pub fn gdn_carry_conv(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    conv_state: DevicePtr,
    new_input: DevicePtr,
    weight: &DenseWeight,
    output: DevicePtr,
    conv_stash: DevicePtr,
    slot_tab: DevicePtr,
    pend: DevicePtr,
    stash_seq_elems: u32,
    num_tokens: u32,
    dim: u32,
    d_conv: u32,
    qk_channels: u32,
    head_dim: u32,
    input_stride: u32,
    output_stride: u32,
    l2_eps: f32,
    n_seq: u32,
    conv_state_seq_stride: u32,
    input_seq_stride: u32,
    output_seq_stride: u32,
    lazy: bool,
    stream: u64,
) -> Result<()>

2026-09-26: Carried-state conv verify (gdn_carry_conv): the twin of gdn_verify_fused_conv_kn_batched that first shifts each sequence’s pending input rows into its window (writing it back when there were any), writes no snapshot and no final window, and stashes the position inputs at conv_stash + slot * stash_seq_elems. lazy must match the verify kernel of the same run (gdn_carry_wy{K}_lazy): the window is then written back only when the stash is full, else on every launch.