Beat zstd on real-world logs

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Smaller files, same speed.

Find a compression setup that beats zstd on ratio at equal or better decompression speed for real-world application logs. Use public log corpora, establish zstd, brotli and xz baselines at several levels, then test dictionaries, preprocessing and column-aware schemes. Report ratio, compression and decompression throughput and memory on identical hardware. Verify every round trip is lossless.