Nomad changes

docs/snippets/dart/plugins/pdf_metadata_extractor.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 implemented in Dart. Creating a
+  // PDF metadata extractor would require implementing the DocumentExtractor
+  // trait, but flutter_rust_bridge does not generate the
+  // createDocumentExtractorDartImpl factory function.
+  //
+  // Implement the PDF metadata extractor in Rust and register it via a
+  // Rust shim crate that links kreuzberg before the Dart host loads the
+  // dynamic library.
+}
+```