fix(review): calc ReadOne reports an inputs-Bad publish; VT inputs-bad counter ticks only on a real report

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Calculation/CalculationDriver.cs

@@ -394,7 +394,11 @@ public sealed class CalculationDriver : IDriver, IDependencyConsumer, ISubscriba
         var now = DateTime.UtcNow;
         lock (_lock)
         {
-            if (!_stateByRawPath.TryGetValue(reference, out var st) || !st.HasValue)
+            // Gated on HAS PUBLISHED, not on "has a value": a tag whose only publish was an inputs-Bad
+            // report has no value of its own, and answering BadWaitingForInitialData for it would tell a
+            // polled reader "never observed" while the subscriber on the same node had been told
+            // BadNoCommunication. Something HAS been observed about such a tag — that its input is dead.
+            if (!_stateByRawPath.TryGetValue(reference, out var st) || !st.HasPublished)
                 return new DataValueSnapshot(null, StatusBadWaitingForInitialData, null, now);
             // Exactly what the subscriber was last told — including a propagated input sub-code. Deriving
             // it from a two-state flag here would make a read disagree with the subscription over the