Optimize FP8 gemm on XPU#2
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Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Split M dimension into chunks when oneDNN fails to create FP8 primitives for large M values (e.g. WAN 2.2 14B FFN layers with M=32760). Benchmarked chunk_m=512 yields 4-8% speedup over dequant+bf16 for FFN shapes. Add COMFY_XPU_FP8_OMNI_LOG env var with 3 levels: 0=off, 1=misses only (default), 2=verbose. Previously all logging was gated by a single bool.
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