v0.3.0

Breaking: now a regular plugin. Composer type wordpress-plugin instead of wordpress-muplugin: it installs into plugins/ and must be activated after updating (wp plugin activate gds-llms). Until then llms.txt and the markdown pages are off.

• Boots on plugins_loaded (priority 0), still ahead of Polylang reading the request URL.
• Translations load through load_plugin_textdomain(); a site's own languages/plugins/ file still takes precedence.
• Installed into plugins/, the bundled generated translation files no longer trip sites' pint pre-commit hooks. (#14)