Module simd 

SIMD-accelerated spatial distance filtering

Provides portable SIMD implementations for 3D distance calculations with runtime CPU feature detection and scalar fallback.

Ported from geographdb_prototype/acceleration/simd_backend.rs

Functions

batch_spatial_filter_nodes

Batch-filter GraphNode4D nodes by L2 distance using SIMD.

distance_filter_l2

Filter points by L2 distance using best available SIMD implementation

distance_filter_scalar

Scalar implementation - guaranteed to work on all platforms