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333e2426 - docs: refresh sparse BF16 handoff after int8/bf16 path separation

docs: refresh sparse BF16 handoff after int8/bf16 path separation Bring the handoff in sync with the refactored state: one native sage_sparse_sdpa path per precision, the deleted sdpa_sparse_bf16.cpp, the re-configure requirement for the GLOB source list, the torch preprocess backend caveat, and the confirmed full-sweep benchmark numbers. Co-Authored-By: Claude <noreply@anthropic.com>