Triton MoE

Self-contained Triton implementation of the HF/OpenAI-style expert MoE layer.

Exports CUDA inference layers:

• triton_moe.layers.MoE: functional benchmark signature.
• triton_moe.layers.OpenaiExperts: HF OpenaiExperts-compatible stateless layer signature.

The implementation uses Triton route grouping, ragged grouped GEMMs, fused routing-weight application, and token-wise top-k reduction. It does not implement backward.