Nomad changes

docs/snippets/elixir/plugins/word_count_processor.exs

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+```elixir title="Elixir"
+alias Kreuzberg.Plugin
+
+# Word Count Post-Processor Plugin
+# This post-processor automatically counts words in extracted content
+# and adds the word count to the metadata.
+
+defmodule MyApp.Plugins.WordCountProcessor do
+  @behaviour Kreuzberg.Plugin.PostProcessor
+  require Logger
+
+  @impl true
+  def name do
+    "WordCountProcessor"
+  end
+
+  @impl true
+  def processing_stage do
+    :post
+  end
+
+  @impl true
+  def version do
+    "1.0.0"
+  end
+
+  @impl true
+  def initialize do
+    :ok
+  end
+
+  @impl true
+  def shutdown do
+    :ok
+  end
+
+  @impl true
+  def process(result, _options) do
+    content = result["content"] || ""
+    word_count = content
+      |> String.split(~r/\s+/, trim: true)
+      |> length()
+
+    # Update metadata with word count
+    metadata = Map.get(result, "metadata", %{})
+    updated_metadata = Map.put(metadata, "word_count", word_count)
+
+    {:ok, Map.put(result, "metadata", updated_metadata)}
+  end
+end
+
+# Register the word count post-processor
+Plugin.register_post_processor(:word_count_processor, MyApp.Plugins.WordCountProcessor)
+
+# Example usage
+result = %{
+  "content" => "The quick brown fox jumps over the lazy dog. This is a sample document with multiple words.",
+  "metadata" => %{
+    "source" => "document.pdf",
+    "pages" => 1
+  }
+}
+
+case MyApp.Plugins.WordCountProcessor.process(result, %{}) do
+  {:ok, processed_result} ->
+    word_count = processed_result["metadata"]["word_count"]
+    IO.puts("Word count added: #{word_count} words")
+    IO.inspect(processed_result, label: "Processed Result")
+
+  {:error, reason} ->
+    IO.puts("Processing failed: #{reason}")
+end
+
+# List all registered post-processors
+{:ok, processors} = Plugin.list_post_processors()
+IO.inspect(processors, label: "Registered Post-Processors")
+```