Fix parallel scheduling across concatenated bzip2 streams - #6
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Replace per-stream decode batches with a memory-accounted rolling candidate queue, keeping workers busy across short streams while preserving CRC validation and bounded speculative output.
This reduces the 1,000-stream enwiki benchmark from 14.282s to 3.881s—within 1.7% of crabz2—and improves full SimpleWiki from 3.711s to 2.244s. It also adds independently runnable benchmark rows and documents fixture regeneration in DEV “Local Wikipedia benchmarks”.