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docs/snippets/csharp/plugins/pdf_metadata_extractor.md

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+```csharp title="C#"
+using Kreuzberg;
+
+var enricher = new PdfMetadataEnricher();
+PostProcessorRegistry.Register(enricher);
+
+public class PdfMetadataEnricher : IPostProcessor
+{
+    private int _processedCount = 0;
+
+    public string Name => "pdf-metadata-enricher";
+    public string Version => "1.0.0";
+
+    public void Initialize()
+    {
+        Console.WriteLine("PDF metadata enricher initialized");
+        _processedCount = 0;
+    }
+
+    public void Shutdown()
+    {
+        Console.WriteLine($"PDF metadata enricher processed {_processedCount} documents");
+    }
+
+    public void Process(ExtractionResult result, ExtractionConfig config)
+    {
+        if (result.MimeType == "application/pdf")
+        {
+            _processedCount++;
+            if (result.Metadata == null)
+            {
+                result.Metadata = new Metadata();
+            }
+            result.Metadata.Author = result.Metadata.Author ?? "Unknown";
+        }
+    }
+
+    public ProcessingStage ProcessingStage()
+    {
+        return ProcessingStage.Early;
+    }
+
+    public bool ShouldProcess(ExtractionResult result, ExtractionConfig config)
+    {
+        return result.MimeType == "application/pdf";
+    }
+
+    public ulong EstimatedDurationMs(ExtractionResult result)
+    {
+        return 50;
+    }
+
+    public int Priority()
+    {
+        return 50;
+    }
+}
+```