Initial commit: Grav CMS setup with HTML reference material

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

user/plugins/email/vendor/symfony/messenger/Stamp/FlushBatchHandlersStamp.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Messenger\Stamp;
+
+/**
+ * Marker telling that any batch handlers bound to the envelope should be flushed.
+ */
+final class FlushBatchHandlersStamp implements NonSendableStampInterface
+{
+    private $force;
+
+    public function __construct(bool $force)
+    {
+        $this->force = $force;
+    }
+
+    public function force(): bool
+    {
+        return $this->force;
+    }
+}