docs(comments): correct 7 stale 'later task/milestone' comments (stillpending §9)

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy/GalaxyDriver.cs

@@ -863,12 +863,12 @@ public sealed class GalaxyDriver
         if (_dataWriter is null)
         {
             // Mirror the IReadable fallback: production write path runs on top of
-            // GalaxyMxSession (PR 4.2 skeleton; PR 4.4 wires the live session). Until
-            // that lands, deployments selecting Galaxy:Backend=mxgateway can't write.
+            // GatewayGalaxyDataWriter, which is wired by InitializeAsync when the gRPC session
+            // connects. This guard fires only if the driver is called before initialization completes.
             throw new NotSupportedException(
                 "GalaxyDriver.WriteAsync requires GatewayGalaxyDataWriter wired against a connected " +
-                "GalaxyMxSession (PR 4.4). Until that lands, route writes through the legacy-host " +
-                "backend (Galaxy:Backend=legacy-host).");
+                "GalaxyMxSession. Call InitializeAsync and wait for a successful connection before " +
+                "issuing writes.");
         }
 
         return _dataWriter.WriteAsync(writes, ResolveSecurity, cancellationToken);
@@ -887,7 +887,7 @@ public sealed class GalaxyDriver
         {
             throw new NotSupportedException(
                 "GalaxyDriver.SubscribeAsync requires a connected GalaxyMxSession + GatewayGalaxySubscriber. " +
-                "PR 4.W wires the production session; until then route subscriptions through the legacy-host backend.");
+                "Call InitializeAsync and wait for a successful connection before subscribing.");
         }
 
         var pump = EnsureEventPumpStarted();
@@ -1103,7 +1103,7 @@ public sealed class GalaxyDriver
         {
             throw new NotSupportedException(
                 "GalaxyDriver.AcknowledgeAsync requires GatewayGalaxyAlarmAcknowledger wired against a connected " +
-                "GalaxyMxSession (PR B.2). InitializeAsync must run before alarm acknowledgements can flow.");
+                "GalaxyMxSession. InitializeAsync must complete successfully before alarm acknowledgements can flow.");
         }
 
         // Acks are issued one-by-one — the gateway RPC accepts a single alarm