Register ca/CA operators + digital signature (938/949 pass) - #18
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- NonStrokeAlpha (ca) and StrokeAlpha (CA) operators registered in graphics_state_params, enabling HiddenTextDetector to find text rendered with zero alpha Also includes complete digital signature signing/verification: - PKCS#7 signing with ByteRange computation - PKCS#7 verification with trusted certificate store
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Fixes hidden text detection and completes digital signatures