v0.2.2

A docs-and-packaging release. The prebuilt release binaries now ship every
collator, the --help/rustdoc text no longer claims the opt-in collators are
unimplemented, and the README leads with direct binary usage.

Changed

• Prebuilt release binaries (GitHub Releases) are now built with
  --all-features, so a downloaded binary includes all five sort schemes
  (pinyin, strokes, jyutping, zhuyin, radical) with no recompile. Source
  installs via cargo install still default to pinyin + strokes; add the
  collator-* features (or --all-features) to opt in.
• README restructured to separate Usage from Development, leading
  with the prebuilt-binary install path, a per-platform asset table, and a
  full read→sort→format→write pipeline example. README.crates.md points at
  the prebuilt binaries for an all-collators install.

Fixed

• --sort-by help text for jyutping, zhuyin, and radical described them
  as "Phase 3.1 … placeholder until implemented" even though they have shipped
  since 0.2.0. The possible-values now carry accurate one-line descriptions,
  and pinyin/strokes gained descriptions too. The same stale wording was
  removed from the rustdoc on AnyCollator::zhuyin / AnyCollator::radical
  and the jyutping / zhuyin / radical module docs.
• --blank-every help wording now says "every N rows" (was "every N lines"),
  matching --columns and the README.
• Homebrew tap auto-sync never ran: the Sync Homebrew Tap workflow triggered
  on release: published, but releases are created by github-actions[bot] with
  GITHUB_TOKEN, which GitHub does not allow to trigger further workflows. It
  now triggers on the tag push, and the generated formula builds with
  --all-features. (The tap formula had been stuck at 0.1.1.)