v0.5.0

v0.5.0

Performance

• Improved Brotli q4-q8 encode time by pruning expensive candidate passes,
  reusing match-chain tables, disabling lazy matching for those qualities, and
  preferring the context8 writer when applicable.
• In the 5591fe6 target-perf report, q4-q8 encode min timings improved
  from v0.3.1 by 2.15x-3.01x on wasm-gc and 3.08x-3.95x on native for the
  Silesia 64 KiB input, and by 2.57x-3.25x on wasm-gc and 3.39x-4.88x on
  native for the Silesia 128 KiB input. The same benchmark rows grew output
  size by 1.77%-2.63%.
• The same report shows q2-q3 encode min timings improving by 1.11x-1.34x and
  q9-q11 by 1.13x-1.77x on the Silesia 64 KiB and 128 KiB inputs, with
  unchanged output sizes in those rows.
• Optimized Brotli encoder prefix lookup paths for command lengths and
  distances, plus context8 literal-tree reuse.
• Added a decoder fast path for compressed meta-blocks with one literal tree
  and one literal block type, avoiding per-literal block tracking.
• Decode benchmark min timings for the 1 MiB Google-produced Silesia streams
  ranged from 1.6% slower to 3.5% faster than v0.3.1, so no material decode
  speedup is claimed for this release.

Tests and docs

• Added white-box coverage for command-prefix tables, distance-prefix mapping,
  hash-chain boundary pre-checks, candidate gating, shared previous-match
  tables, and lazy-match deferral.
• Added roundtrip coverage for literal-heavy streams and lazy-match deferral
  inputs across multiple Brotli qualities.
• Regenerated the 0.5.0 Brotli release benchmark report and current benchmark
  JSONL files.