Nomad changes

docs/snippets/dart/plugins/plugin_extractor.md

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+<!-- snippet:skip reason="DocumentExtractor trait has no createDocumentExtractorDartImpl factory in the generated Dart binding; custom extractors must be written and registered in Rust." -->
+```dart title="Dart"
+import 'package:kreuzberg/kreuzberg.dart';
+
+Future<void> main() async {
+  // Custom document extractors cannot be implemented in Dart. While the
+  // traits.dart file includes the DocumentExtractor abstract class,
+  // flutter_rust_bridge does not generate a createDocumentExtractorDartImpl
+  // factory function, so there is no way to bridge Dart closures into the
+  // extractor registry.
+  //
+  // Implement custom extractors in Rust and register them via a Rust shim
+  // crate that links kreuzberg before the Dart host loads the dynamic library.
+}
+```