fix: PHP CLI request is not handled correctly

Spark request is instance of CLIRequest, but if I remove the
`$this->request instanceof CLIRequest`, PHPStan outputs the error:
 ------ ------------------------------------------------------------------
  Line   system/CodeIgniter.php
 ------ ------------------------------------------------------------------
  830    Call to an undefined method CodeIgniter\HTTP\Request::getArgs().
 ------ ------------------------------------------------------------------

Author: kenjis

system/CodeIgniter.php

@@ -815,14 +815,25 @@ protected function createController()
      */
     protected function runController($class)
     {
-        if ($this->request instanceof CLIRequest) {
-            // This is a console request
+        /*
+         CI4 supports three types of requests:
+           1. Web: URI segments become parameters, sent to Controllers via Routes,
+              output controlled by Headers to browser
+           2. Spark: accessed by CLI via the spark command, arguments are Command arguments,
+              sent to Commands by CommandRunner, output controlled by CLI class
+           3. PHP CLI: accessed by CLI via php public/index.php, arguments become URI segments,
+              sent to Controllers via Routes, output varies
+        */
+
+        if (defined('SPARKED') && $this->request instanceof CLIRequest) {
+            // This is a Spark request
             $params = $this->request->getArgs();
 
             $output = method_exists($class, '_remap')
                 ? $class->_remap($this->method, $params)
                 : $class->{$this->method}($params);
         } else {
+            // This is a Web request or PHP CLI request
             $params = $this->router->params();
 
             if (method_exists($class, '_remap')) {