docs: add inline documentation where missing

src/Logger/UserDataProcessor.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Logger;
 
 use App\Entity\User;
@@ -8,6 +10,12 @@ use Monolog\LogRecord;
 use Symfony\Bundle\SecurityBundle\Security;
 use Symfony\Component\Security\Core\Authentication\Token\SwitchUserToken;
 
+/**
+ * Enriches log records with current user information.
+ *
+ * Adds username and roles to log entries for audit trails. Handles CLI context
+ * (system user), anonymous requests, and user impersonation via SwitchUserToken.
+ */
 #[AsMonologProcessor]
 class UserDataProcessor
 {