fix(store-and-forward): inline ordered replication dispatch; Warning + counter on replication failures

src/ZB.MOM.WW.ScadaBridge.StoreAndForward/ReplicationService.cs

@@ -1,4 +1,5 @@
 using Microsoft.Extensions.Logging;
+using ZB.MOM.WW.ScadaBridge.Commons.Observability;
 using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
 
 namespace ZB.MOM.WW.ScadaBridge.StoreAndForward;
@@ -133,19 +134,32 @@ public class ReplicationService
 
     private void FireAndForget(ReplicationOperation operation)
     {
-        Task.Run(async () =>
+        // Invoked inline, NOT via Task.Run: the handler is a non-blocking Akka
+        // Tell, and thread-pool hand-off destroyed Add/Remove ordering for the
+        // same message id (arch review 02). Inline invocation preserves issue
+        // order; Akka's per-sender/receiver guarantee preserves it on the wire.
+        try
         {
-            try
+            var task = _replicationHandler!.Invoke(operation);
+            if (!task.IsCompletedSuccessfully)
             {
-                await _replicationHandler!.Invoke(operation);
+                task.ContinueWith(t =>
+                    {
+                        ScadaBridgeTelemetry.RecordReplicationFailure();
+                        _logger.LogWarning(t.Exception,
+                            "Replication of {OpType} for message {MessageId} failed (best-effort); standby buffer may be diverging",
+                            operation.OperationType, operation.MessageId);
+                    },
+                    TaskContinuationOptions.OnlyOnFaulted);
             }
-            catch (Exception ex)
-            {
-                _logger.LogDebug(ex,
-                    "Replication of {OpType} for message {MessageId} failed (best-effort)",
-                    operation.OperationType, operation.MessageId);
-            }
-        });
+        }
+        catch (Exception ex)
+        {
+            ScadaBridgeTelemetry.RecordReplicationFailure();
+            _logger.LogWarning(ex,
+                "Replication of {OpType} for message {MessageId} failed (best-effort); standby buffer may be diverging",
+                operation.OperationType, operation.MessageId);
+        }
     }
 }