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FuzzNewManifestFromReader fails when the parser returns both or neither of a manifest and an error, or allocates more than sixteen times its input plus MaxDecompressedSize. make test runs the committed seed corpus; make fuzz fuzzes for one minute, by hand only. Parser bug: MaxDecompressedSize did not bound decompression. The zstd decoder kept its own 64 GiB limit, set aside whatever size a frame header claimed, and decoded payloads under 128 KiB in full before the LimitReader read any of it, so a 92-byte manifest claiming 8 GiB made the parser allocate 8 GiB. The decoder now has MaxDecompressedSize as its limit; that manifest is a regression seed. Model: opus-5-5