OSV-2026-136 Memcpy-param-overlap in grk::memStreamRead

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=478035120 Crash type: Memcpy-param-overlap Crash state: grk::memStreamRead grk::BufferedStream::read grk::MarkerParser::readSOTorEOC...