Installation in Symfony?

How can this extension be enabled in Symfony? At https://github.com/alisqi/TwigQI?tab=readme-ov-file#usage you're saying:

$twig->addExtension(new AlisQI\TwigQI\Extension());

But I don't think I have that. According to https://symfony.com/doc/current/reference/dic_tags.html#twig-extension it should be enabled automatically?

How can I verify that this is running? In which files are those E_USER_* errors logged by default?

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