feat: Add PixelReader interface and Threshold filter#7
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Add uniform per-pixel access across drivers (GD, Imagick, PNG) via PixelReader interface with getPixelRgb() and getLuminance() methods. Add Threshold binarization filter for image preprocessing.
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Summary
PixelReaderinterface for uniform per-pixel RGB/luminance accessGdResource,ImagickResource,PngResourceThresholdbinarization filter (used by barcode detection in horde/Barcode)Refs horde/Barcode#1
Test plan
getPixelRgb()returns correct values on known-color imagesgetLuminance()matches BT.601 formula