Align readme stable tag with release version and trim changelog surface

[Copilot]

The plugin readme still advertised Stable tag: trunk and carried an excessively long inline changelog. This updates release metadata to the current version and limits readme.txt to recent changelog entries with a pointer to full history.

• Release metadata

  • Updated readme.txt stable tag from trunk to 4.0.8 (current plugin/package version).

• Changelog scope in readme.txt

  • Reduced inline changelog to recent entries (4.0.8, 4.0.7, 4.0.6).
  • Added a canonical link to full release history in CHANGELOG.md on the development branch.

• Versioning workflow update (Grunt)

  • Extended grunt-version config to update readme.txt stable tag during version bumps, so future releases keep metadata synchronized automatically.

readmetxt: {
  options: {
    prefix: 'Stable tag:\\s*',
  },
  src: [ 'readme.txt' ],
},

• Fixes #620

[pirate-bot]

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