scripts/check-plugin-version.mjs fails loud when plugin.json or
marketplace.json drift from package.json; wired as 'npm run check-plugin'
and enforced by tests/plugin-version.test.js (also asserts every new
command has a backing file and is described). Prevents the drift recurring.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Manav Arya Singh