feat(site-runtime): stamp IsMesReportable on the Instance Actor alarm snapshot

Claude-Session: https://claude.ai/code/session_01Y5ef34iUUMjmwnMpL9xgmB

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/Actors/InstanceActor.cs

@@ -51,6 +51,16 @@ public class InstanceActor : ReceiveActor
     private readonly Dictionary<string, AlarmState> _alarmStates = new();
     private readonly Dictionary<string, DateTimeOffset> _alarmTimestamps = new();
     private readonly Dictionary<string, int> _alarmPriorities = new();
+
+    /// <summary>
+    /// Computed-alarm canonical name → the deployed <c>ResolvedAlarm.IsMesReportable</c>
+    /// flag. Populated alongside <see cref="_alarmPriorities"/> when the Alarm Actor
+    /// children are created and read back in <see cref="BuildAlarmStatesSnapshot"/>, which
+    /// is the single place the flag is stamped — so a fired alarm (served from the retained
+    /// event) and an unfired one (served from the bare fallback projection) cannot drift.
+    /// Native conditions have no entry here and correctly resolve to false.
+    /// </summary>
+    private readonly Dictionary<string, bool> _alarmMesReportable = new();
     private readonly Dictionary<string, IActorRef> _scriptActors = new();
     private readonly Dictionary<string, IActorRef> _alarmActors = new();
     private readonly Dictionary<string, IActorRef> _nativeAlarmActors = new();
@@ -1568,7 +1578,16 @@ public class InstanceActor : ReceiveActor
     /// </summary>
     private List<AlarmStateChanged> BuildAlarmStatesSnapshot()
     {
-        var states = _latestAlarmEvents.Values.ToList();
+        // The MES-reportable flag is stamped HERE and nowhere else (not at the Alarm
+        // Actor's emit sites), so the retained-event rows below and the fallback rows
+        // that follow always agree on it. A native condition has no _alarmMesReportable
+        // entry and is returned as-is (no record copy) — the default false is the intended
+        // result, and native rows dominate this list on a busy binding.
+        var states = _latestAlarmEvents.Values
+            .Select(e => _alarmMesReportable.TryGetValue(e.AlarmName, out var mes) && mes
+                ? e with { IsMesReportable = true }
+                : e)
+            .ToList();
 
         foreach (var name in _alarmActors.Keys)
         {
@@ -1582,7 +1601,10 @@ public class InstanceActor : ReceiveActor
                 name,
                 _alarmStates.GetValueOrDefault(name, AlarmState.Normal),
                 _alarmPriorities.GetValueOrDefault(name, 0),
-                _alarmTimestamps.GetValueOrDefault(name, DateTimeOffset.UtcNow)));
+                _alarmTimestamps.GetValueOrDefault(name, DateTimeOffset.UtcNow))
+            {
+                IsMesReportable = _alarmMesReportable.GetValueOrDefault(name)
+            });
         }
 
         // A native binding is "already represented" if any retained event carries its
@@ -1980,6 +2002,7 @@ public class InstanceActor : ReceiveActor
             var actorRef = Context.ActorOf(props, $"alarm-{alarm.CanonicalName}");
             _alarmActors[alarm.CanonicalName] = actorRef;
             _alarmPriorities[alarm.CanonicalName] = alarm.PriorityLevel;
+            _alarmMesReportable[alarm.CanonicalName] = alarm.IsMesReportable;
             _alarmTimestamps[alarm.CanonicalName] = DateTimeOffset.UtcNow;
             RouteChild(actorRef, TriggerRouting.ForAlarm(alarm.TriggerType, alarm.TriggerConfiguration));
         }