v0.2.6

• Decoder output into uninitialized memory. DecoderSession and
  DecoderSessionOwned have process_uninit, and Decompressor has
  decompress_to_uninit and decompress_with_dictionary_to_uninit, as in
  mbrotli. Each takes &mut [MaybeUninit<u8>], such as
  Vec::spare_capacity_mut, and writes exactly the bytes it reports,
  nothing past them; a session's DecodeFailure has written exactly its
  produced prefix. Bytes, counts, statuses and errors match process,
  decompress_to_slice and decompress_with_dictionary_to_slice, and
  process and process_uninit may be mixed on one operation. The crate
  stays free of unsafe. Sessions only ever copy finished output out of
  their history, so process_uninit writes the caller's memory once and
  never zeroes it. The one-shot direct path reads its output back as history,
  so it zeroes the destination through borrowed-buf one block ahead of the
  decoder and never past a frame's declared end; raw and RLE blocks are
  written once without zeroing. The decompression feature now pulls in
  borrowed-buf. The decoder is generic over its destination rather than
  matching on it, so process runs the code it ran before: streaming 4 MiB
  of mixed data took 2.81 ms against 2.84 ms before the change (Criterion,
  benches/decompress.rs, Apple M5 Pro). Against decompress_to_slice,
  decompress_to_uninit took 0.97-1.05 times as long on 4 MiB of text and
  binary at levels 1, 3 and 19 and on a 12 MiB LDM frame, and the same on
  random data; process_uninit took 2.83 ms against 2.81 ms for process.
  New Criterion cases mzstd-uninit cover both paths.
• mzstd_decompress no longer zeroes the destination. The C ABI views
  the caller's buffer as MaybeUninit<u8> and calls
  decompress_to_uninit, so on success no byte past the result is written.
  mzstd-ffi drops its borrowed-buf dependency. On
  mzstd-ffi/benches/one_shot.rs, 256 KiB of random data decodes in
  2.93 µs instead of 3.84 µs and 1 MiB of text 0-2.5% faster. The
  large-literal corpus is 2-4% slower, and a 64-byte frame takes 30 ns
  instead of 25 ns at level -5 and 1.5-3% longer at other levels.
• Fix FrameMode::Single with skippable frames. A single-frame
  operation skipped skippable frames and kept waiting for a Zstandard frame,
  unlike ZSTD_decompressStream, which reports a frame complete after
  either kind. A trailing skippable frame, or a stream made only of
  skippable frames, failed with UnexpectedEndOfInput although zstd reads
  it, and a skippable frame followed by a Zstandard frame decoded both in
  one member where zstd stops after the skippable one. Single now ends
  after exactly one frame of either kind: a skippable frame finishes the
  operation with no output and leaves what follows unconsumed (one-shot
  calls report it as TrailingData). Sessions, one-shots and the io
  adapters change alike; FrameMode::Concatenated is unchanged. Regression
  tests compare member-by-member decoding with the reference through the
  new zstd_ffi::oracle::decompress_first_frame.
• 0 restores a compression parameter's default. Every numeric
  with_* setter of CompressionParams and LdmParams stores 0 as
  unset, as ZSTD_CCtx_setParameter(.., 0) does. The last value given now
  wins, and a caller translating zstd-style parameters can apply each one
  directly in its loop instead of collecting them in Options first.
  Before, with_window_log(0) stored Some(0) and Compressor::new rejected
  it as out of range, and no setter could clear a value. 0 was already
  accepted by with_target_length and LdmParams::with_hash_rate_log and
  meant the default there, so no frame changes.
• Tests and fuzzing. tests/decoder_uninit.rs compares the new
  methods with their initialized counterparts across corpora, levels, input
  chunks, output windows, failures, frame sequences and dictionaries, with
  sentinels past every reported length. The AFL decoder targets alternate
  process and process_uninit, and decompress checks
  decompress_to_uninit; parameter_parsing accepts a zero window log.
  The architecture adds a
  decoder uninitialized output
  specification.