Nomad changes

docs/snippets/php/config/pdf_config.md

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+```php title="PHP"
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+use function Kreuzberg\extract_file;
+use Kreuzberg\Config\ExtractionConfig;
+use Kreuzberg\Config\PdfConfig;
+
+/**
+ * PDF configuration with hierarchy detection
+ */
+$config = new ExtractionConfig(
+    pdf: new PdfConfig(
+        extractImages: true,
+        extractMetadata: true,
+        passwords: ['password1', 'password2'],
+        hierarchy: [
+            'enabled' => true,
+            'k_clusters' => 6,
+            'include_bbox' => true,
+            'ocr_coverage_threshold' => 0.5
+        ]
+    )
+);
+
+$result = extract_file('document.pdf', config: $config);
+
+echo "Content length: " . strlen($result->content) . " characters\n";
+echo "Metadata: " . implode(', ', array_keys((array) $result->metadata)) . "\n";
+```