Zijie Tian f173a3f7f5 ✅ test: add xattn_estimate vs low-level kernels alignment test ...

Test that xattn_estimate produces the same results as manually calling:
- flat_group_gemm_fuse_reshape
- softmax_fuse_block_sum
- find_blocks_chunked

Uses real KV cache data from results/kvcache/ directory.
Verifies density calculation matches between high-level API and kernels.

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via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

2026-02-01 17:49:37 +08:00

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