refactor: remove ClusterClient streaming path (DebugStreamEvent), events flow via gRPC

tests/ScadaLink.Commons.Tests/ArchitecturalConstraintTests.cs

@@ -136,6 +136,15 @@ public class ArchitecturalConstraintTests
         }
     }
 
+    [Fact]
+    public void DebugStreamEvent_ShouldNotExist()
+    {
+        // DebugStreamEvent was removed when debug streaming moved from ClusterClient to gRPC.
+        // Events now flow via SiteStreamManager → StreamRelayActor → gRPC channel.
+        var type = CommonsAssembly.GetTypes().FirstOrDefault(t => t.Name == "DebugStreamEvent");
+        Assert.Null(type);
+    }
+
     [Fact]
     public void AllEnums_ShouldBeSingularNamed()
     {