Add return type declarations

flight/commands/AiGenerateInstructionsCommand.php

@@ -33,7 +33,7 @@ public function __construct(array $config)
      *
      * @return int
      */
-    public function execute()
+    public function execute(): int
     {
         $io = $this->app()->io();
 

flight/commands/AiInitCommand.php

@@ -27,7 +27,7 @@ public function __construct(array $config)
      *
      * @return int
      */
-    public function execute()
+    public function execute(): int
     {
         $io = $this->app()->io();
 

flight/commands/ControllerCommand.php

@@ -26,7 +26,7 @@ public function __construct(array $config)
      *
      * @return void
      */
-    public function execute(string $controller)
+    public function execute(string $controller): void
     {
         $io = $this->app()->io();
 

flight/commands/RouteCommand.php

@@ -37,7 +37,7 @@ public function __construct(array $config)
      *
      * @return void
      */
-    public function execute()
+    public function execute(): void
     {
         $io = $this->app()->io();
 

flight/net/Request.php

@@ -375,7 +375,7 @@ public static function getHeaders(): array
      *
      * @return string
      */
-    public static function header(string $header, $default = '')
+    public static function header(string $header, $default = ''): string
     {
         return self::getHeader($header, $default);
     }