test(otopcua): Once re-discovery reruns one pass per reconnect + comment tidy (follow-up B)

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DriverInstanceActor.cs

@@ -805,10 +805,11 @@ public sealed class DriverInstanceActor : ReceiveActor, IWithTimers
 
         Context.Parent.Tell(new DiscoveredNodesReady(_driverInstanceId, nodes));
 
-        // Honour the driver's re-discovery policy. A Once driver discovers synchronously in its single
-        // DiscoverAsync, so a single published pass is complete — do not schedule another tick. (Never never
-        // reaches here — StartDiscovery returns before the first tick.) UntilStable falls through to the
-        // stop-on-stable + attempt-cap logic below.
+        // Honour the driver's re-discovery policy. A Once driver runs a single post-connect pass per
+        // (re)connect regardless of whether DiscoverAsync is synchronous or async — one published pass is
+        // complete, so the retry loop is skipped (no further tick scheduled). (Never never reaches here —
+        // StartDiscovery returns before the first tick.) UntilStable falls through to the stop-on-stable +
+        // attempt-cap logic below.
         if (discovery.RediscoverPolicy == DiscoveryRediscoverPolicy.Once)
         {
             _log.Debug("DriverInstance {Id}: RediscoverPolicy=Once — single discovery pass, not scheduling another", _driverInstanceId);