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docs/snippets/dart/plugins/unregister_plugins.md

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+```dart title="Dart"
+import 'package:kreuzberg/kreuzberg.dart';
+
+Future<void> main() async {
+  // Custom-plugin construction (createXxxDartImpl) is unreachable from Dart
+  // due to opaque BoxFn closure types in the flutter_rust_bridge binding,
+  // so this snippet exercises the lifecycle against the *built-in* renderer
+  // registry (markdown / html / djot / plain).
+
+  var renderers = await KreuzbergBridge.listRenderers();
+  print('Renderers before unregister: $renderers');
+
+  // Unregister a single renderer by name.
+  await KreuzbergBridge.unregisterRenderer('plain');
+  renderers = await KreuzbergBridge.listRenderers();
+  print('Renderers after unregister: $renderers');
+
+  // Bulk-clear all renderers (including remaining built-ins).
+  await KreuzbergBridge.clearRenderers();
+  renderers = await KreuzbergBridge.listRenderers();
+  print('Renderers after clear: $renderers');
+}
+```