Nomad changes

docs/snippets/ruby/plugins/plugin_testing.md

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+```ruby title="Ruby"
+require 'kreuzberg'
+require 'rspec'
+
+describe 'Plugin Testing' do
+  it 'registers and calls post-processor' do
+    processor = ->(result) { result['metadata'] ||= {}; result }
+    Kreuzberg.register_post_processor('test', processor)
+    expect(Kreuzberg.list_post_processors).to include('test')
+    Kreuzberg.unregister_post_processor('test')
+  end
+
+  it 'registers and validates' do
+    validator = ->(result) do
+      raise StandardError, 'Too short' if result['content'].length < 10
+    end
+    Kreuzberg.register_validator('test-val', validator)
+    expect(Kreuzberg.list_validators).to include('test-val')
+    Kreuzberg.unregister_validator('test-val')
+  end
+end
+```