chore(mesh): Batch A review close-out — fusion-invariant note on DispatchTimeoutSeconds, tracking updates

src/Core/ZB.MOM.WW.OtOpcUa.Cluster/MeshTransportOptions.cs

@@ -131,6 +131,9 @@ public sealed class MeshTransportOptions
     ///     unbounded call to one unreachable node would stall the commands queued behind it. Expiry
     ///     is logged and dropped — the transport is fire-and-forget and layers no retry, so the
     ///     deploy path's 2-minute apply deadline stays the only recovery mechanism.
+    ///     Validation of this key is scoped to driver-role nodes; that covers the central pair only
+    ///     because central nodes are always fused (<c>admin,driver,cluster-*</c>). A pure-admin
+    ///     central node would leave this unvalidated on the node that uses it.
     /// </remarks>
     public int DispatchTimeoutSeconds { get; set; } = 10;