📈 feat: add NVTX markers to XAttention for profiling
Add NVTX range markers to track XAttention performance:
- GPU-only: xattn_estimate, xattn_bsa_compute
- Offload: xattn_estimate_gemm, xattn_estimate_softmax,
xattn_estimate_find_blocks, xattn_compute_historical,
xattn_compute_current, xattn_compute_merge
These markers enable detailed nsys profiling to identify
performance bottlenecks in estimate vs compute phases.
Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)
Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>
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