fix(types): P1 — type: ignore[abstract] for plugin-discovery cls() call in registry

decnet/services/registry.py

@@ -28,7 +28,7 @@ def _load_plugins() -> None:
     for cls in BaseService.__subclasses__():
         if not cls.__module__.startswith("decnet.services."):
             continue
-        instance = cls()
+        instance = cls()  # type: ignore[abstract]
         _registry[instance.name] = instance
     _loaded = True