feat: affine transforms (rotate/translate/scale/shear) - #16
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Adds the Affine 2x3 matrix type (rotation/translation/scaling/shear, composition, inversion) and Image::affine rendering via inverse mapping with bilinear resampling; uncovered areas become transparent. Convenience wrappers: rotate(degrees) about center, translate(dx, dy). Closes #6
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Adds a proper affine transform layer on top of the existing bilinear machinery:
Closes #6