refactor: susun semula struktur folder — Laravel source ke src/

vendor/laravel/pail/src/Guards/EnsurePcntlIsAvailable.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Laravel\Pail\Guards;
+
+use RuntimeException;
+
+class EnsurePcntlIsAvailable
+{
+    /**
+     * Checks if the pcntl extension is available.
+     */
+    public static function check(): void
+    {
+        if (! function_exists('pcntl_fork')) {
+            throw new RuntimeException('The [pcntl] extension is required to run Pail.');
+        }
+    }
+}