Galaxy IPC unblock — live dev-box E2E path

Three root-cause fixes to get an elevated dev-box shell past session open
through to real MXAccess reads:

1. PipeAcl — drop BUILTIN\Administrators deny ACE. UAC's filtered token
   carries the Admins SID as deny-only, so the deny fired even from
   non-elevated admin-account shells. The per-connection SID check in
   PipeServer.VerifyCaller remains the real authorization boundary.

2. PipeServer — swap the Hello-read / VerifyCaller order. ImpersonateNamedPipeClient
   returns ERROR_CANNOT_IMPERSONATE until at least one frame has been read
   from the pipe; reading Hello first satisfies that rule. Previously the
   ACL deny-first path masked this race — removing the deny ACE exposed it.

3. GalaxyIpcClient — add a background reader + single pending-response
   slot. A RuntimeStatusChange event between OpenSessionRequest and
   OpenSessionResponse used to satisfy the caller's single ReadFrameAsync
   and fail CallAsync with "Expected OpenSessionResponse, got
   RuntimeStatusChange". The reader now routes response kinds (and
   ErrorResponse) to the pending TCS and everything else to a handler the
   driver registers in InitializeAsync. The Proxy was already set up to
   raise managed events from RaiseDataChange / RaiseAlarmEvent /
   OnHostConnectivityUpdate — those helpers had no caller until now.

4. RedundancyPublisherHostedService — swallow BadServerHalted while
   polling host.Server.CurrentInstance. StandardServer throws that code
   during startup rather than returning null, so the first poll attempt
   crashed the BackgroundService (and the host) before OnServerStarted
   ran. This race was latent behind the Galaxy init failure above.

Updates docs that described the Admins deny ACE + mandatory non-elevated
shells, and drops the admin-skip guards from every Galaxy integration +
E2E fixture that had them (IpcHandshakeIntegrationTests, EndToEndIpcTests,
ParityFixture, LiveStackFixture, HostSubprocessParityTests).

Adds GalaxyIpcClientRoutingTests covering the router's
request/response match, ErrorResponse, event-between-call, idle event,
and peer-close paths.

Verified live on the dev box against the p7-smoke cluster (gen 6):
driver registered=1 failedInit=0, Phase 7 bridge subscribed, OPC UA
server up on 4840, MXAccess read round-trip returns real data with
Status=0x00000000.

Task #112 — partial: Galaxy live stack is functional end-to-end. The
supplied test-galaxy.ps1 script still fails because the UNS walker
encodes TagConfig JSON as the tag's NodeId instead of the seeded TagId
(pre-existing; separate issue from this commit).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy/GalaxyProxyDriver.cs

@@ -1,3 +1,4 @@
+using MessagePack;
 using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 using ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian;
 using ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy.Ipc;
@@ -48,6 +49,12 @@ public sealed class GalaxyProxyDriver(GalaxyProxyOptions options)
             _client = await GalaxyIpcClient.ConnectAsync(
                 options.PipeName, options.SharedSecret, options.ConnectTimeout, cancellationToken);
 
+            // Route Host-pushed event frames to the matching Raise* methods. Must be set BEFORE
+            // the first CallAsync so a RuntimeStatusChange arriving between OpenSessionRequest
+            // and OpenSessionResponse lands on the handler rather than unblocking the call with
+            // the wrong kind.
+            _client.SetEventHandler(DispatchHostEventAsync);
+
             var resp = await _client.CallAsync<OpenSessionRequest, OpenSessionResponse>(
                 MessageKind.OpenSessionRequest,
                 new OpenSessionRequest { DriverInstanceId = DriverInstanceId, DriverConfigJson = driverConfigJson },
@@ -459,6 +466,37 @@ public sealed class GalaxyProxyDriver(GalaxyProxyOptions options)
 
     // ---- helpers ----
 
+    /// <summary>
+    ///     Event-handler registered with <see cref="GalaxyIpcClient.SetEventHandler"/>. Decodes
+    ///     the MessagePack body into the matching wire contract and delegates to the existing
+    ///     <c>Raise*</c> helpers. Unknown kinds are silently ignored — the IPC contract is
+    ///     append-only, so a newer Host sending a kind this Proxy doesn't recognise shouldn't
+    ///     break the session.
+    /// </summary>
+    private Task DispatchHostEventAsync(MessageKind kind, byte[] body)
+    {
+        switch (kind)
+        {
+            case MessageKind.OnDataChangeNotification:
+                RaiseDataChange(MessagePackSerializer.Deserialize<OnDataChangeNotification>(body));
+                break;
+            case MessageKind.AlarmEvent:
+                RaiseAlarmEvent(MessagePackSerializer.Deserialize<GalaxyAlarmEvent>(body));
+                break;
+            case MessageKind.HostConnectivityStatus:
+                OnHostConnectivityUpdate(MessagePackSerializer.Deserialize<IpcHostConnectivityStatus>(body));
+                break;
+            case MessageKind.RuntimeStatusChange:
+                var rsc = MessagePackSerializer.Deserialize<RuntimeStatusChangeNotification>(body);
+                OnHostConnectivityUpdate(rsc.Status);
+                break;
+            // HistorianConnectivityStatus has no consumer on this Proxy today — drop.
+            // Response kinds never reach the event handler; the client routes those to
+            // their pending CallAsync TCS.
+        }
+        return Task.CompletedTask;
+    }
+
     private GalaxyIpcClient RequireClient() =>
         _client ?? throw new InvalidOperationException("Driver not initialized");