Nomad changes

docs/snippets/php/plugins/extractor_registration.md

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+```php title="PHP"
+<?php declare(strict_types=1);
+
+use Kreuzberg\Kreuzberg;
+
+class CustomJsonExtractor implements DocumentExtractor {
+    public function name(): string {
+        return "custom-json-extractor";
+    }
+
+    public function version(): string {
+        return "1.0.0";
+    }
+
+    public function initialize(): void {
+        // Initialize resources
+    }
+
+    public function shutdown(): void {
+        // Cleanup resources
+    }
+
+    public function extractBytes(string $content, string $mimeType, object $config): object {
+        $json = json_decode($content, true);
+        $text = $this->extractTextFromJson($json);
+
+        return (object)[
+            'content' => $text,
+            'mime_type' => 'application/json',
+            'metadata' => [],
+            'tables' => [],
+            'detected_languages' => null,
+            'chunks' => null,
+            'images' => null,
+        ];
+    }
+
+    public function supportedMimeTypes(): array {
+        return ["application/json", "text/json"];
+    }
+
+    public function priority(): int {
+        return 50;
+    }
+
+    private function extractTextFromJson($value): string {
+        if (is_string($value)) {
+            return "$value\n";
+        }
+        if (is_array($value)) {
+            $result = "";
+            foreach ($value as $item) {
+                $result .= $this->extractTextFromJson($item);
+            }
+            return $result;
+        }
+        return "";
+    }
+}
+
+// Register the custom extractor
+// Note: Document extractor registration would use a similar pattern
+// when the binding API is available
+$extractor = new CustomJsonExtractor();
+Kreuzberg::registerDocumentExtractor($extractor);
+```