fix(calculation): read cache carries real input status + timestamps

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

@@ -547,11 +547,9 @@ public sealed class CalculationDriver : IDriver, IDependencyConsumer, ISubscriba
             return;
         }
 
-        // Projected to bare values for now — the evaluator's own read cache still fabricates Good, which
-        // the next task fixes by handing it the snapshots. Only reachable with USABLE inputs (the Bad
-        // hold above returned), so nothing Bad is being flattened here.
-        var depValues = pending.Dependencies.ToDictionary(kv => kv.Key, kv => kv.Value.Value, StringComparer.Ordinal);
-        var result = _evaluator.Evaluate(def.RawPath, def.ScriptSource, depValues);
+        // Snapshots, not bare values: the script's ctx.GetTag(path).StatusCode / .SourceTimestampUtc are
+        // then the input's real ones rather than a fabricated Good stamped at evaluation time (05/STAB-19).
+        var result = _evaluator.Evaluate(def.RawPath, def.ScriptSource, pending.Dependencies);
 
         string? failureReason = null;
         (object? Value, uint StatusCode)? toPublish;