refactor!: improve types in platform api (#376)

I was just tired of doing those `assert($response instanceof ...);`
statements
also resolves the special status of `AsyncResponse` by decoupling it
from the `ResponseInterface`

WDYT?

Author: chr-hertel

src/Agent.php

@@ -20,7 +20,6 @@
 use Symfony\AI\Platform\Message\MessageBagInterface;
 use Symfony\AI\Platform\Model;
 use Symfony\AI\Platform\PlatformInterface;
-use Symfony\AI\Platform\Response\AsyncResponse;
 use Symfony\AI\Platform\Response\ResponseInterface;
 use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
 use Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface;
@@ -76,11 +75,7 @@ public function call(MessageBagInterface $messages, array $options = []): Respon
         }
 
         try {
-            $response = $this->platform->request($model, $messages, $options);
-
-            if ($response instanceof AsyncResponse) {
-                $response = $response->unwrap();
-            }
+            $response = $this->platform->request($model, $messages, $options)->getResponse();
         } catch (ClientExceptionInterface $e) {
             $message = $e->getMessage();
             $content = $e->getResponse()->toArray(false);

src/Toolbox/Tool/SimilaritySearch.php

@@ -14,7 +14,6 @@
 use Symfony\AI\Agent\Toolbox\Attribute\AsTool;
 use Symfony\AI\Platform\Model;
 use Symfony\AI\Platform\PlatformInterface;
-use Symfony\AI\Platform\Vector\Vector;
 use Symfony\AI\Store\Document\VectorDocument;
 use Symfony\AI\Store\VectorStoreInterface;
 
@@ -41,8 +40,7 @@ public function __construct(
      */
     public function __invoke(string $searchTerm): string
     {
-        /** @var Vector[] $vectors */
-        $vectors = $this->platform->request($this->model, $searchTerm)->getContent();
+        $vectors = $this->platform->request($this->model, $searchTerm)->asVectors();
         $this->usedDocuments = $this->vectorStore->query($vectors[0]);
 
         if (0 === \count($this->usedDocuments)) {