[P] Fused MoE Dispatch in Pure Triton: Beating CUDA-Optimized Megablocks at Inference Batch Sizes

I built a fused MoE dispatch kernel in pure Triton that handles the full forward pass for Mixture-of-Experts models. No CUDA, no vendor-specific code. On Mixtral-8x7B (A100), it beats Stanford's Megablocks at inference-relevant batch sizes (131% at 32 tokens, 124% at 128 tokens). At larger batches Megablocks' hand-tuned CUDA pulls ahead as expected. Two main contributions: Fused gate+up projection - both GEMMs share the same input tile load, SiLU computed in registers. Eliminates ~470MB of intermediate buffers per forward pass (35% memory traffic reduction.