Add incremental LZ4 streaming reads - #13
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fbz::Readernow supports LZ4 through the same bounded output, cancellation, and sticky-error path as bzip2 and gzip. LZ4 frames are parsed incrementally, with independent blocks scheduled in bounded batches and linked blocks retaining their rolling history.Low-memory decoding falls back cleanly to serial blocks, Reader overhead is 1.005× the direct writer path, and peak RSS fell from 71.0 MiB to 58.9 MiB. See “Streaming reads” in README and “Architecture” and “Local Reader benchmark” in DEV for details.