auto-round

2e635bc1 - feat: add independent native-precision sparse SDPA kernel path

feat: add independent native-precision sparse SDPA kernel path Wire up the dormant SPARSESDPAFwdMainloop into a new SparseSDPAConfig with ElementQ-aware (bf16/fp16) MMA, plus launchers, a wrapper, declarations, and a sage_sparse_sdpa pybind. Native-precision path applies the softmax scale directly and carries no INT8 dequant baggage, unlike the shared sparse-SAGE path.