Merge fix/c3-session-lifecycle: GWC-32 WorkerClient dispose is terminal, GWC-34 attach-after-dispose throws SessionNotReady, GWC-37 subtag watch-list coverage graded on provider status + re-resolved at failover edge

src/ZB.MOM.WW.MxGateway.IntegrationTests/TestSupport/EmptyAlarmWatchListResolver.cs

@@ -1,4 +1,3 @@
-using ZB.MOM.WW.MxGateway.Contracts.Proto;
 using ZB.MOM.WW.MxGateway.Server.Alarms;
 using ZB.MOM.WW.MxGateway.Server.Configuration;
 
@@ -19,14 +18,18 @@ public sealed class EmptyAlarmWatchListResolver : IAlarmWatchListResolver
     /// <summary>Shared no-op instance.</summary>
     public static readonly EmptyAlarmWatchListResolver Instance = new();
 
-    private static readonly IReadOnlyList<AlarmSubtagTarget> Empty = [];
+    private static readonly AlarmWatchListResolution Empty = new(
+        [],
+        DiscoveryAttempted: false,
+        DiscoveryFailed: false,
+        DiscoveryFailureMessage: null);
 
     private EmptyAlarmWatchListResolver()
     {
     }
 
     /// <inheritdoc />
-    public Task<IReadOnlyList<AlarmSubtagTarget>> ResolveAsync(
+    public Task<AlarmWatchListResolution> ResolveAsync(
         AlarmsOptions options,
         CancellationToken cancellationToken = default)
     {