colour-science / colour / 34368907018

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Separate cubic-spline and PCHIP interpolation into three clean layers.

Replace the tangled scipy-or-native conditionals with an explicit
architecture:
  - _ArrayInterpolator (+ _ArrayCubicSplineInterpolator, _ArrayPchipInterpolator):
    the native, autodiff-preserving numerics, standalone and scipy-free,
    exposing the scipy interp1d/PchipInterpolator x/y/__call__ contract.
  - scipy.interpolate.interp1d / PchipInterpolator: the NumPy reference, used
    directly.
  - _BackendAwareInterpolator: the unifying dispatcher; public
    CubicSplineInterpolator and PchipInterpolator subclass it and only supply
    the two implementation factories. It routes NumPy queries to scipy and
    everything else (incl. non-NumPy queries against a NumPy-built interpolator)
    to the native impl.

Strengthen test__call__scipy_parity to compare the native impl against an
independently constructed scipy interpolator, so it exercises the native path
on every backend including NumPy.

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