v0.2.0

First stable release. Adds a fifth first-party port for Dart and Flutter and
closes every cross-port divergence found in a full parity audit of the four
existing ports, so all five now produce byte-identical output on an extended
shared fixture suite.

New port: smooth_reading (Dart, pub.dev)

• Pure Dart, zero dependencies, Dart 3.0+ (Flutter 3.10+); runs in Flutter on
  every platform, on the server and on the web.
• tokenize returns a sealed Token (WordToken / SeparatorToken) that
  maps directly onto Flutter TextSpans; toHtml, toMarkdown,
  fixationLength, a const SmoothOptions, and escapeHtml.
• A Segmenter interface: the default SpecSegmenter is the spec's regex
  scanner (identical output to the Python port); apps can plug in a platform
  ICU break iterator for dictionary-based Chinese, Japanese and Thai breaks
  without touching the algorithm.
• A Flutter recipe (docs/recipes/flutter.md): SmoothText widget,
  selectable variant, and an ICU segmenter over a platform channel.

Parity fixes (algorithm and markup)

• Kotlin: out-of-range fixation, saccade and minWordLength are clamped
  instead of throwing, as the spec and every other port already did.
• Kotlin: CDATA sections and unterminated comments pass through exactly as in
  the TypeScript core; previously the markup could be corrupted.
• Swift: the default (no locale) path now uses the same dictionary-based
  word breaker as the explicit-locale path, so Chinese and Japanese are
  broken into words by default as in every other port.
• Swift: an empty className emits class="" like the other ports.
• Tag names follow one grammar in every port (the TypeScript rule: a name
  runs to whitespace, / or >; </ code> closes; <code / > self-closes).
• Regex-fallback tokenizers (TypeScript without Intl.Segmenter, Python,
  Kotlin's SpecWordSegmenter, Dart) share one run rule: a continuous run of
  Han, Kana, Hangul, Thai, Lao, Khmer or Myanmar characters is one word,
  split from adjacent text of other scripts (iPhone手机 → iPhone +
  手机), with combining marks attached. The table of code-point ranges is
  now in the spec.
• Python: non-integer numeric options are truncated then clamped instead of
  raising, matching the TypeScript core.

Fixtures and spec

• New fixtures/common cases for option clamping, CDATA, unterminated
  comments, the tag-name grammar and script-boundary splitting; every port
  passes them.
• docs/SPEC.md documents the known, accepted differences between ICU word
  breaking and the regex fallback (3.14, 1,000, snake_case, ½, Khmer
  coeng clusters) and the optional break-iterator hook.

Release engineering

• release.yml publishes smooth_reading to pub.dev (automated publishing)
  and verifies the Dart version; ci.yml tests Dart 3.0.0 and stable.
• npm now publishes under the latest dist-tag; PyPI as a normal release.