Joomla 6 doesn't call <scriptfile> for templates. Instead, run
migration on first page load via index.php:
- Detect MokoCassiopeia styles → copy params to MokoOnyx
- Create matching style copies for additional styles
- Set MokoOnyx as default if Cassiopeia was default
- Copy user files (custom themes, user.css, user.js)
- Redirect update server to MokoOnyx
- Creates .migrated marker so it only runs once
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
