GetMeshNode timeout: probe the target hub too, not just the reader

src/MeshWeaver.Mesh.Contract/MeshNodeStreamExtensions.cs

@@ -1422,10 +1422,30 @@ void EmitError(Exception error)
                 string diagnostics;
                 try { diagnostics = hub.GetPendingRequestDiagnostics(); }
                 catch (Exception diagEx) { diagnostics = $"<diagnostics unavailable: {diagEx.GetType().Name}>"; }
+                // …and the OWNER's state, which is what actually decides the verdict. The reader's
+                // snapshot alone proves only that the reader is innocent (idle queues + our request
+                // still pending = "the reply never came"), leaving "owner never activated" and
+                // "owner answered, reply lost" indistinguishable. HostedHubCreation.Never is a pure
+                // probe — a dictionary lookup that must NEVER activate the hub as a side effect of
+                // diagnosing it.
+                string targetState;
+                try
+                {
+                    targetState = string.Equals(hub.Address.ToString(), path, StringComparison.Ordinal)
+                        ? "Target: this hub itself."
+                        : hub.GetHostedHub(new Address(path), HostedHubCreation.Never) is { } owner
+                            ? $"Target: {owner.GetPendingRequestDiagnostics()}"
+                            : $"Target: NO LOCAL HUB at '{path}' — it never activated here (or is owned "
+                              + "by another silo), so no reply was ever going to be produced.";
+                }
+                catch (Exception targetEx)
+                {
+                    targetState = $"<target diagnostics unavailable: {targetEx.GetType().Name}>";
+                }
                 var message =
                     $"GetMeshNode('{path}') timed out after {elapsed.TotalSeconds:F1}s "
                     + $"(budget {budget.TotalSeconds:F0}s) — the owning per-node hub never answered the "
-                    + $"GetDataRequest. This is NOT 'node not found'. {diagnostics}";
+                    + $"GetDataRequest. This is NOT 'node not found'. Reader: {diagnostics} {targetState}";
                 // Best-effort log. This runs on the CTS timer thread and the hub (with its
                 // ServiceProvider) may already be torn down — an exception escaping here would
                 // be an unobserved fault on a pool thread, i.e. exactly the class of failure

test/MeshWeaver.Hosting.Monolith.Test/GetMeshNodeTimeoutSurfacingTest.cs

@@ -88,6 +88,11 @@ public async Task ReadTimesOut_MessageCarriesPendingRequestDiagnostics()
             + "that never arrived, as opposed to a hub busy with something else");
         ex.Message.Should().Contain("RunLevel",
             "the snapshot must carry the hub's run level and queue state");
+        ex.Message.Should().Contain("Reader:",
+            "the reader's state must be labelled — it is only half the verdict");
+        ex.Message.Should().Contain("Target:",
+            "the OWNER's state is what separates 'never activated' from 'answered but the reply "
+            + "was lost'; without it the reader snapshot alone cannot close the diagnosis");
     }
 
     /// <summary>