Nomad changes

docs/snippets/dart/plugins/extractor_registration.md

@@ -0,0 +1,15 @@
+<!-- snippet:skip reason="DocumentExtractor trait has no createDocumentExtractorDartImpl factory; custom extractors must be implemented in Rust." -->
+```dart title="Dart"
+import 'package:kreuzberg/kreuzberg.dart';
+
+Future<void> main() async {
+  // Custom document extractors cannot be registered from Dart. While
+  // registerDocumentExtractor exists in the KreuzbergBridge API, there is
+  // no createDocumentExtractorDartImpl factory to construct a Dart-based
+  // extractor implementation.
+  //
+  // Built-in extractors are registered automatically when the library
+  // initializes. Custom extractors must be written in Rust and linked into
+  // a Rust shim crate before the Dart host process loads the dynamic library.
+}
+```