Nomad changes

docs/snippets/csharp/plugins/stateful_plugin.md

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+```csharp title="C#"
+using Kreuzberg;
+using System.Collections.Concurrent;
+
+var processor = new StatefulPostProcessor();
+PostProcessorRegistry.Register(processor);
+
+public class StatefulPostProcessor : IPostProcessor
+{
+    private int _callCount = 0;
+    private readonly ConcurrentDictionary<string, string> _cache = new();
+
+    public string Name => "stateful-processor";
+    public string Version => "1.0.0";
+
+    public void Initialize()
+    {
+        Console.WriteLine("Stateful processor initialized");
+        _callCount = 0;
+        _cache.Clear();
+    }
+
+    public void Shutdown()
+    {
+        Console.WriteLine($"Stateful processor called {_callCount} times");
+        Console.WriteLine($"Cache contains {_cache.Count} entries");
+    }
+
+    public void Process(ExtractionResult result, ExtractionConfig config)
+    {
+        _callCount++;
+
+        var key = $"last_mime_{_callCount}";
+        _cache.TryAdd(key, result.MimeType);
+
+        Console.WriteLine($"Processing #{_callCount}: {result.MimeType}");
+    }
+
+    public ProcessingStage ProcessingStage()
+    {
+        return ProcessingStage.Middle;
+    }
+
+    public bool ShouldProcess(ExtractionResult result, ExtractionConfig config)
+    {
+        return true;
+    }
+
+    public ulong EstimatedDurationMs(ExtractionResult result)
+    {
+        return 5;
+    }
+
+    public int Priority()
+    {
+        return 50;
+    }
+}
+```