fix(quic): bounds-check token_len in Initial packet parser#244
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A crafted Initial packet with an oversized variable-length token length pushed the parse offset past the end of the packet, panicking on the next slice. Use checked arithmetic and verify offset is in range before slicing.
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A crafted Initial packet with an oversized variable-length token length pushed the parse offset past the end of the packet, panicking on the next slice. Use checked arithmetic and verify offset is in range before slicing.