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docs/snippets/csharp/pdf_metadata_extractor.md

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+```csharp title="C#"
+using Kreuzberg;
+
+var processor = new PdfMetadataExtractor();
+KreuzbergLib.RegisterPostProcessor(processor);
+
+public class PdfMetadataExtractor : IPostProcessor
+{
+    private int _processedCount = 0;
+
+    public string Name() => "pdf_metadata_extractor";
+    public string Version() => "1.0.0";
+    public string Description() => "Extracts and enriches PDF metadata";
+    public string ProcessingStage() => "early";
+
+    public bool ShouldProcess(ExtractionResult result)
+        => result.MimeType == "application/pdf";
+
+    public ExtractionResult Process(ExtractionResult result)
+    {
+        _processedCount++;
+        return result;
+    }
+
+    public void Initialize()
+    {
+        Console.WriteLine("PDF metadata extractor initialized");
+    }
+
+    public void Shutdown()
+    {
+        Console.WriteLine($"Processed {_processedCount} PDFs");
+    }
+}
+```