Cohere2 moe support#1
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Adds GGUF conversion and C++ inference for Cohere2MoeForCausalLM / Cohere2VisionForConditionalGeneration (CohereLabs Command A+, 218B/25B active). Key design points: parallel attention+FFN block sharing a single pre-norm, sliding window attention on 3 of every 4 layers with RoPE only on SWA layers, sigmoid-gated sparse MoE with 128 experts (8 active) plus 4 always-on shared experts averaged before residual addition, and head_dim=128 explicit (not derived from hidden_size/n_heads). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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