Fix latent UAF by boxing Compress to stabilize cinfo address#53
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This PR boxes the
Compressstruct insideCompressStartedto ensure thejpeg_compress_structmaintains a stable heap address afterstart_compressis called.This prevents internal C back-pointers (like those in progressive huffman or custom destination managers) from becoming dangling pointers to a popped stack frame when the struct is moved.
Fixes issue #52