Feat: Pending Email Change Updates, Moving Mailables to core

src/Customer/Exceptions/InvalidEmailChangeCodeException.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Modules\Core\Customer\Exceptions;
+
+use RuntimeException;
+
+/**
+ * Thrown by Modules\Core\Customer\Services\CustomerEmailChangeService::
+ * confirm() for a wrong, expired, or already-burned (too many wrong
+ * guesses) code — deliberately one exception for all three, the same way
+ * Auth\Services\UserOtpService::validate() collapses them into a single
+ * null return, so a caller can't distinguish "wrong code" from "no
+ * pending change at all" and use that to probe for one.
+ */
+class InvalidEmailChangeCodeException extends RuntimeException
+{
+    public function __construct()
+    {
+        parent::__construct('That code is invalid or has expired.');
+    }
+}