feat(recording): add safety limits and adaptive headers

test/servicios/servicio_grabacion_radio_test.dart

@@ -6,6 +6,7 @@ import 'package:http/http.dart' as http;
 import 'package:http/testing.dart';
 import 'package:pluriwave/modelos/emisora.dart';
 import 'package:pluriwave/servicios/servicio_grabacion_radio.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 void main() {
   group('ServicioGrabacionRadio', () {
@@ -76,6 +77,35 @@ void main() {
       await controller.close();
       await servicio.dispose();
     });
+
+    test('se detiene automáticamente al alcanzar el tamaño máximo', () async {
+      SharedPreferences.setMockInitialValues({});
+      final dir = await Directory.systemTemp.createTemp('pluriwave-rec-max-');
+      final controller = StreamController<List<int>>();
+      final servicio = ServicioGrabacionRadio(
+        cliente: _StreamClient(controller.stream),
+        resolverDirectorioBase: () async => dir,
+      );
+
+      await servicio.inicializar();
+      await servicio.guardarMaxBytes(3);
+      await servicio.iniciar(
+        const Emisora(
+          uuid: 'r3',
+          nombre: 'Radio Corta',
+          url: 'https://stream.example/short',
+          codec: 'mp3',
+        ),
+      );
+      controller.add([1, 2, 3]);
+      await Future<void>.delayed(Duration.zero);
+      await Future<void>.delayed(const Duration(milliseconds: 20));
+
+      expect(servicio.estado.tipo, EstadoGrabacionRadioTipo.inactiva);
+      await controller.close();
+      await servicio.dispose();
+    });
+
   });
 }