CPoint arithmetic, quadratic solver, float range checks, RealMatrix
(multiply, transpose, LU with and without pivoting, substitution, inverse,
least squares), power-basis surface evaluation and derivatives, array
reallocation. Shim, ffi wrappers, difftest runner and fixtures: 3076 cases
bit-identical to upstream.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
bherbruck