Got adding working again

Toolkit.Foundation/NotificationAttribute.cs

@@ -5,9 +5,3 @@ public class NotificationAttribute(object key) : Attribute
 {
     public object Key => key;
 }
-
-public class EnumerateAttribute(object key,
-    AggerateMode mode = AggerateMode.Reset) : NotificationAttribute(key)
-{
-    public AggerateMode Mode => mode;
-}