Voyager

--- Causal Depthwise Conv1D (Mamba/SSM) Core operator in Mamba state-space models. Each channel is convolved independently with a causal filter: y[b,d,t] = bias[d] + Σ weight[d,k] * x[b,d,t-k], left-zero-padded for causality. Single dynamic Helion kernel specializes only on filter width W (unrolls the inner loop) while B, D, N stay dynamic — cutting JIT compilations from 8 down to 3, solving a 12-min CI timeout. Config autotuned on Nebius B200. ---