fix(inbound-api): defer DI-scope disposal to handler completion and count abandoned executions — closes the timeout use-after-dispose

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

src/ZB.MOM.WW.ScadaBridge.Commons/Observability/ScadaBridgeTelemetry.cs

@@ -37,6 +37,11 @@ public static class ScadaBridgeTelemetry
         Meter.CreateCounter<long>("scadabridge.inbound_api.requests", unit: "1",
             description: "Inbound API requests, tagged by method.");
 
+    /// <summary>Incremented each time an inbound execution is abandoned (handler outlived its request), tagged with the API method.</summary>
+    private static readonly Counter<long> _inboundAbandonedExecutions =
+        Meter.CreateCounter<long>("scadabridge.inbound_api.abandoned_executions", unit: "1",
+            description: "Inbound API executions abandoned after timeout/abort (handler still running), tagged by method.");
+
     /// <summary>Incremented each time an S&amp;F buffer replication op fails to dispatch/deliver to the peer.</summary>
     private static readonly Counter<long> _replicationFailures =
         Meter.CreateCounter<long>("scadabridge.store_and_forward.replication.failures", unit: "1",
@@ -75,6 +80,11 @@ public static class ScadaBridgeTelemetry
     public static void RecordInboundApiRequest(string method) =>
         _inboundApiRequests.Add(1, new KeyValuePair<string, object?>("method", method));
 
+    /// <summary>Records that an inbound execution was abandoned (handler outlived its request) for the given <paramref name="method"/>.</summary>
+    /// <param name="method">The API method whose execution was abandoned.</param>
+    public static void RecordInboundAbandonedExecution(string method) =>
+        _inboundAbandonedExecutions.Add(1, new KeyValuePair<string, object?>("method", method));
+
     /// <summary>Records one failed S&amp;F replication dispatch.</summary>
     public static void RecordReplicationFailure() => _replicationFailures.Add(1);