`npm run version` now runs `changeset version` and then
`scripts/sync-plugin-version.mjs`, which copies the new version into
`.claude-plugin/plugin.json`. The release workflow calls `npm run version`
instead of `npx changeset version`, so the version PR carries both files.
Also closes the drift this replaces: `plugin.json` was manually bumped to
1.2.1 while `package.json` stayed at 1.2.0. `package.json` moves up to
1.2.1 so the plugin version never goes backwards.
`npm run check-plugin-version` reports drift without writing.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
