chore: remove php-http/multipart-stream-builder as a required dependency

Author: stainless-app[bot]

composer.json

@@ -1,10 +1,7 @@
 {
   "$schema": "https://getcomposer.org/schema.json",
   "autoload": {
-    "files": [
-      "src/Core.php",
-      "src/Client.php"
-    ],
+    "files": ["src/Core.php", "src/Client.php"],
     "psr-4": {
       "Anthropic\\": "src/"
     }
@@ -26,13 +23,12 @@
     "preferred-install": "dist",
     "sort-packages": true
   },
-  "license": "APACHE-2.0",
   "description": "Anthropic PHP SDK",
+  "license": "APACHE-2.0",
   "name": "anthropic-ai/sdk",
   "require": {
     "php": "^8.1",
     "php-http/discovery": "^1",
-    "php-http/multipart-stream-builder": "^1",
     "psr/http-client": "^1",
     "psr/http-client-implementation": "^1",
     "psr/http-factory-implementation": "^1",

src/Core/Concerns/SdkModel.php

@@ -203,8 +203,6 @@ public function jsonSerialize(): array
     }
 
     /**
-     * @internal
-     *
      * @param array<string, mixed> $data
      */
     public static function fromArray(array $data): self

src/Core/Contracts/BaseStream.php

@@ -10,6 +10,8 @@
 use Psr\Http\Message\ResponseInterface;
 
 /**
+ * @internal
+ *
  * @template TInner
  *
  * @extends \IteratorAggregate<int, TInner>

src/Core/Conversion/UnionOf.php

@@ -9,6 +9,9 @@
 use Anthropic\Core\Conversion\Contracts\Converter;
 use Anthropic\Core\Conversion\Contracts\ConverterSource;
 
+/**
+ * @internal
+ */
 final class UnionOf implements Converter
 {
     /**