Constant DEFAULT_GPU_MIN_POINTS 

pub const DEFAULT_GPU_MIN_POINTS: usize = usize::MAX; // 18_446_744_073_709_551_615usize

Default minimum point count before GPU voxel downsampling is selected (centroid).

The 2026-07-16 end-to-end rebaseline found no GPU crossover through 2M point_xyzi points after the CPU fast paths landed. Auto therefore stays on CPU until a new crossover is demonstrated. Explicit GPU execution remains available with VoxelGridDownsampleConfig::without_gpu_min_points.