fix(runtime): VT script failure/timeout degrades node quality to Bad once per transition (02/S13)

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/VirtualTags/VirtualTagActorTests.cs

@@ -4,6 +4,7 @@ using Shouldly;
 using Xunit;
 using ZB.MOM.WW.OtOpcUa.Commons.Engines;
 using ZB.MOM.WW.OtOpcUa.Commons.Messages.Logging;
+using ZB.MOM.WW.OtOpcUa.Commons.OpcUa;
 using ZB.MOM.WW.OtOpcUa.Runtime.Tests.Harness;
 using ZB.MOM.WW.OtOpcUa.Runtime.VirtualTags;
 
@@ -80,7 +81,10 @@ public sealed class VirtualTagActorTests : RuntimeActorTestBase
             entry.VirtualTagId.ShouldBe("vt-1");
         }, duration: TimeSpan.FromMilliseconds(500));
 
-        parent.ExpectNoMsg(TimeSpan.FromMilliseconds(100));
+        // 02/S13: the failure now ALSO degrades the node — with no declared dependencyRefs the
+        // inputs-ready gate is vacuously satisfied, so a Bad EvaluationResult reaches the parent (this
+        // replaces the old ExpectNoMsg, which encoded the stale-Good bug).
+        parent.ExpectMsg<VirtualTagActor.EvaluationResult>().Quality.ShouldBe(OpcUaQuality.Bad);
     }
 
     /// <summary>Test evaluator that sums integer dependency values.</summary>