Delegate image processing to raygeo.image, keep only Cairo wrappers#284
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Replace pure-Python implementations of srgb_to_linear, linear_to_srgb, compute_auto_levels, normalize_grayscale, dithering algorithms, and surface_to_* conversions with calls to raygeo.image Rust functions. The surface_to_* functions remain as thin Cairo surface buffer extraction wrappers that delegate to raygeo.image.rgba_to_grayscale/binary/inplace. The pure-array dither functions (apply_floyd_steinberg_dither, apply_bayer_dither, apply_minimum_run_length) are removed from rayforge.image.dither and imported from raygeo.image instead. srgb.py retains create_lut_from_color and resize_linear_nd which have no raygeo equivalents.
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Summary
Stripped-down version of #278 containing only the image processing delegation to
raygeo.imageRust functions.raygeo.imageRust functionssurface_to_*functions remain as thin Cairo surface buffer extraction wrappersChanges by file
grayscale.pysurface_to_grayscale/binary/inplace→ extract Cairo buffer, callraygeo.image.rgba_to_*. Removedcompute_auto_levels,normalize_grayscale(now fromraygeo.image)srgb.pysrgb_to_linear/linear_to_srgbnow delegate toraygeo.image. Retainscreate_lut_from_colorandresize_linear_nd(no Rust equivalents)dither.pyapply_floyd_steinberg_dither/apply_bayer_dither/apply_minimum_run_lengthremoved, imported fromraygeo.image.surface_to_dithered_arrayusesraygeo.image.rgba_to_grayscale+ Rust dither__init__.pycompute_auto_levels/normalize_grayscalere-exported fromraygeo.imageraster_widget.pycompute_auto_levelsfromraygeo.imagedirectlyfloat32→uint8), adjusted rounding expectationsNot included (compared to #278)