Nomad changes

docs/snippets/ruby/plugins/pdf_metadata_extractor.md

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+```ruby title="Ruby"
+require 'kreuzberg'
+
+class PdfMetadataExtractor
+  def initialize
+    @count = 0
+  end
+
+  def call(result)
+    return result unless result['mime_type'] == 'application/pdf'
+    @count += 1
+    result['metadata'] ||= {}
+    result['metadata']['pdf_order'] = @count
+    result
+  end
+end
+
+extractor = PdfMetadataExtractor.new
+Kreuzberg.register_post_processor('pdf_metadata', extractor)
+
+config = Kreuzberg::ExtractionConfig.new(
+  postprocessor: { enabled: true }
+)
+
+result = Kreuzberg.extract_file_sync('report.pdf', config: config)
+puts "Metadata: #{result.metadata.inspect}"
+```