fix(site-runtime,dcl): low-severity cleanups — observed adapter dispose (S9), alarm-filter overwrite warning (S10), bounded-channel comment (C2), invariant-culture condition fallback (C6)

src/ZB.MOM.WW.ScadaBridge.DataConnectionLayer/Actors/DataConnectionActor.cs

@@ -229,7 +229,12 @@ public class DataConnectionActor : UntypedActor, IWithStash, IWithTimers
     {
         _log.Info("DataConnectionActor [{0}] stopping — disposing adapter", _connectionName);
         _adapter.Disconnected -= OnAdapterDisconnected;
-        _ = _adapter.DisposeAsync().AsTask();
+        // S9: fire-and-forget, but observe a faulted dispose so a failing adapter
+        // teardown is logged rather than swallowed into an unobserved task exception.
+        _adapter.DisposeAsync().AsTask().ContinueWith(
+            t => _log.Warning("[{0}] Adapter dispose faulted on stop: {1}",
+                _connectionName, t.Exception?.GetBaseException().Message),
+            TaskContinuationOptions.OnlyOnFaulted);
     }
 
     /// <inheritdoc />
@@ -1829,6 +1834,17 @@ public class DataConnectionActor : UntypedActor, IWithStash, IWithTimers
             _alarmSourceSubscribers[request.SourceReference] = subs;
         }
         subs.Add(subscriber);
+        // S10: the adapter feed carries a single shared condition filter per source.
+        // A second subscriber with a different filter silently overwrites the first
+        // (last-writer-wins). Surface it so a co-subscriber mismatch is diagnosable —
+        // co-subscribers to one source are expected to agree on the filter.
+        if (_alarmSourceFilter.TryGetValue(request.SourceReference, out var existingFilter)
+            && !string.Equals(existingFilter, request.ConditionFilter, StringComparison.Ordinal))
+        {
+            _log.Warning(
+                "[{0}] Alarm condition filter for source {1} overwritten: '{2}' -> '{3}' (last subscriber wins; co-subscribers must agree)",
+                _connectionName, request.SourceReference, existingFilter, request.ConditionFilter);
+        }
         _alarmSourceFilter[request.SourceReference] = request.ConditionFilter;
         // Parse the type-name filter once; this is the authoritative client-side
         // gate consulted on every routed transition.