Merge pull request #73 from AdaWorldAPI/claude/qwen-claude-reverse-eng-vHuHv

feat: hhtl_cascade_search score_fn callback — LEAF level pluggable

score_fn(row, col) -> f32 replaces the hardcoded 1.0 placeholder.
lance-graph passes LanceDB VectorSearch as the LEAF backend.
ndarray provides the cascade logic. lance-graph provides the data.

23 p64 tests passing.

https://claude.ai/code/session_01M3at4EuHVvQ8S95mSnKgtK

Author: AdaWorldAPI

.cargo/config.toml

@@ -1,4 +1,4 @@
 [build]
-# x86-64-v4 = AVX-512 baseline. All BF16 SIMD paths use native __m512d.
-# Rust 1.94 stable. No nightly.
-rustflags = ["-C", "target-cpu=x86-64-v4"]
+# No global target-cpu. Each kernel uses #[target_feature(enable = "avx512f")]
+# per-function, with LazyLock runtime detection. One binary, all ISAs.
+# Railway (AVX-512) and GitHub CI (AVX2) use the same binary.