Nomad changes

docs/snippets/csharp/stateful_plugin.md

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+```csharp title="C#"
+using System.Collections.Generic;
+using System.Threading;
+
+public class StatefulPlugin
+{
+    private readonly object _lock = new();
+    private int _callCount = 0;
+    private readonly Dictionary<string, object> _cache = new();
+
+    public string Name() => "stateful-plugin";
+    public string Version() => "1.0.0";
+
+    public Dictionary<string, object> Process(Dictionary<string, object> result)
+    {
+        lock (_lock)
+        {
+            _callCount++;
+            _cache["last_mime"] = result["mime_type"];
+        }
+        return result;
+    }
+
+    public void Initialize() { }
+    public void Shutdown() { }
+}
+```