Nomad changes

docs/snippets/csharp/advanced/custom_postprocessor.cs

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+using Kreuzberg;
+
+class WordCountPostProcessor : IPostProcessor
+{
+    public string Name => "word-count";
+    public int Priority => 10;
+
+    public ExtractionResult Process(ExtractionResult result)
+    {
+        var wordCount = result.Content.Split(
+            new[] { ' ', '\n', '\r', '\t' },
+            StringSplitOptions.RemoveEmptyEntries
+        ).Length;
+
+        if (result.Metadata.Additional == null)
+        {
+            result.Metadata.Additional = new Dictionary<string, System.Text.Json.Nodes.JsonNode?>();
+        }
+        result.Metadata.Additional["word_count"] = System.Text.Json.Nodes.JsonValue.Create(wordCount);
+
+        return result;
+    }
+}
+
+class SentimentPostProcessor : IPostProcessor
+{
+    public string Name => "sentiment-analyzer";
+    public int Priority => 5;
+
+    public ExtractionResult Process(ExtractionResult result)
+    {
+        var sentiment = AnalyzeSentiment(result.Content);
+
+        if (result.Metadata.Additional == null)
+        {
+            result.Metadata.Additional = new Dictionary<string, System.Text.Json.Nodes.JsonNode?>();
+        }
+        result.Metadata.Additional["sentiment"] = System.Text.Json.Nodes.JsonValue.Create(sentiment);
+
+        return result;
+    }
+
+    private string AnalyzeSentiment(string text)
+    {
+        return text.Length > 0 ? "neutral" : "unknown";
+    }
+}
+
+class Program
+{
+    static void Main()
+    {
+        var wordCountProcessor = new WordCountPostProcessor();
+        var sentimentProcessor = new SentimentPostProcessor();
+
+        KreuzbergLib.RegisterPostProcessor(wordCountProcessor);
+        KreuzbergLib.RegisterPostProcessor(sentimentProcessor);
+
+        try
+        {
+            var result = KreuzbergLib.ExtractFileSync("document.pdf");
+
+            if (result.Metadata.Additional != null)
+            {
+                if (result.Metadata.Additional.TryGetValue("word_count", out var wordCount))
+                {
+                    Console.WriteLine($"Word count: {wordCount}");
+                }
+                if (result.Metadata.Additional.TryGetValue("sentiment", out var sentiment))
+                {
+                    Console.WriteLine($"Sentiment: {sentiment}");
+                }
+            }
+        }
+        catch (KreuzbergException ex)
+        {
+            Console.WriteLine($"Error: {ex.Message}");
+        }
+    }
+}