pub fn compute_gaussian_kernel(std_deviation: f32) -> ([f32; 13], u8)Expand description
Compute 1D Gaussian kernel weights for separable convolution.
Returns (kernel_weights, kernel_size) where kernel_size = 2×radius + 1.
The kernel is stored in a fixed-size array to avoid heap allocation.
Uses the standard Gaussian formula: G(x) = exp(-x² / (2σ²)), normalized to sum to 1.