Fix ToolboxStreamResponse instantiation by passing the correct object type

Author: oesteve

src/agent/src/Toolbox/AgentProcessor.php

@@ -80,7 +80,7 @@ public function processOutput(Output $output): void
 
         if ($result instanceof GenericStreamResponse) {
             $output->setResult(
-                new ToolboxStreamResponse($result->getContent(), $this->handleToolCallsCallback($output))
+                new ToolboxStreamResponse($result, $this->handleToolCallsCallback($output))
             );
 
             return;