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Add ModelOpt Triton attention kernels for WAN2.2 diffusion (sparse, skip-softmax, NVFP4) #1190

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Add nvfp4 kernel choice for standalone SageAttention in example script

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Add ModelOpt Triton attention kernels for WAN2.2 diffusion (sparse, skip-softmax, NVFP4) #1190

Add nvfp4 kernel choice for standalone SageAttention in example script
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