PR 4.W — Galaxy:Backend wiring + server-side factory registration

- GalaxyDriver.InitializeAsync now builds the production gw runtime (MxGatewayClient,
  GalaxyMxSession, GatewayGalaxySubscriber, GatewayGalaxyDataWriter,
  ReconnectSupervisor, HostConnectivityForwarder, PerPlatformProbeWatcher) when no
  test seams are pre-injected; Dispose tears the chain down in order.
- GetHealth surfaces supervisor.IsDegraded as DriverState.Degraded so a transport
  drop is observable without polling the supervisor directly.
- DiscoverAsync now refreshes the per-platform probe watcher's membership against
  $WinPlatform / $AppEngine objects after every discovery pass.
- OnPumpDataChange routes ScanState changes through the probe watcher in addition
  to fanning out OnDataChange to ISubscribable consumers.
- Server registers GalaxyDriver under "GalaxyMxGateway" alongside the legacy
  "Galaxy" GalaxyProxyDriver factory so DriverInstance rows can opt in.
- Bumped Server.Tests' Microsoft.Extensions.Logging.Abstractions to 10.0.7 to
  resolve the downgrade pulled in transitively via MxGateway.Client.
- Lifecycle factory tests switched to the internal seam-injection ctor so they
  no longer attempt a real gRPC connect during InitializeAsync.

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

tests/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/GalaxyDriverFactoryTests.cs

@@ -1,7 +1,10 @@
+using MxGateway.Contracts.Proto;
 using Shouldly;
 using Xunit;
 using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 using ZB.MOM.WW.OtOpcUa.Core.Hosting;
+using ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Config;
+using ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Runtime;
 
 namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests;
 
@@ -118,7 +121,12 @@ public sealed class GalaxyDriverFactoryTests
     [Fact]
     public async Task DriverLifecycle_InitializeShutdown_ToggleHealth()
     {
-        var driver = GalaxyDriverFactoryExtensions.CreateInstance("galaxy-x", MinimalConfig);
+        // Inject a no-op subscriber seam so InitializeAsync skips BuildProductionRuntimeAsync
+        // (no gw connect attempt). The factory tests only care about the lifecycle health
+        // toggle; real-runtime wire-up is exercised in PR 4.W's BuildProductionRuntime tests.
+        using var driver = new GalaxyDriver(
+            "galaxy-x", BuildOptions(), hierarchySource: null, dataReader: null,
+            dataWriter: null, subscriber: new NoopSubscriber());
         driver.GetHealth().State.ShouldBe(DriverState.Unknown);
 
         await driver.InitializeAsync(MinimalConfig, CancellationToken.None);
@@ -135,7 +143,9 @@ public sealed class GalaxyDriverFactoryTests
     [Fact]
     public async Task ReinitializeAsync_RefreshesHealth()
     {
-        var driver = GalaxyDriverFactoryExtensions.CreateInstance("galaxy-x", MinimalConfig);
+        using var driver = new GalaxyDriver(
+            "galaxy-x", BuildOptions(), hierarchySource: null, dataReader: null,
+            dataWriter: null, subscriber: new NoopSubscriber());
         await driver.InitializeAsync(MinimalConfig, CancellationToken.None);
         var firstStamp = driver.GetHealth().LastSuccessfulRead!.Value;
 
@@ -147,6 +157,34 @@ public sealed class GalaxyDriverFactoryTests
         driver.GetHealth().LastSuccessfulRead!.Value.ShouldBeGreaterThan(firstStamp);
     }
 
+    private static GalaxyDriverOptions BuildOptions() => new(
+        new GalaxyGatewayOptions("https://mxgw.test:5001", "key"),
+        new GalaxyMxAccessOptions("OtOpcUa-A"),
+        new GalaxyRepositoryOptions(),
+        new GalaxyReconnectOptions());
+
+    /// <summary>
+    ///     Minimum-surface <see cref="IGalaxySubscriber"/> seam — enough to satisfy
+    ///     <see cref="GalaxyDriver.InitializeAsync"/>'s "skip production-runtime build" branch
+    ///     without driving any actual subscribe/event-pump traffic.
+    /// </summary>
+    private sealed class NoopSubscriber : IGalaxySubscriber
+    {
+        public Task<IReadOnlyList<SubscribeResult>> SubscribeBulkAsync(
+            IReadOnlyList<string> fullReferences, int bufferedUpdateIntervalMs, CancellationToken cancellationToken)
+            => Task.FromResult<IReadOnlyList<SubscribeResult>>([]);
+
+        public Task UnsubscribeBulkAsync(IReadOnlyList<int> itemHandles, CancellationToken cancellationToken)
+            => Task.CompletedTask;
+
+        public async IAsyncEnumerable<MxEvent> StreamEventsAsync(
+            [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
+        {
+            await Task.CompletedTask;
+            yield break;
+        }
+    }
+
     [Fact]
     public void Dispose_IsIdempotent_AndShutdownAfterDisposeIsHarmless()
     {
@@ -163,4 +201,42 @@ public sealed class GalaxyDriverFactoryTests
         await Should.ThrowAsync<ObjectDisposedException>(() =>
             driver.InitializeAsync(MinimalConfig, CancellationToken.None));
     }
+
+    [Fact]
+    public void DriverImplementsAllPhase4Capabilities()
+    {
+        // PR 4.W contract pin — every capability the in-process Galaxy driver must
+        // expose for parity with GalaxyProxyDriver. If any of these regress, the
+        // Galaxy:Backend flag flip in PR 7.1 will silently lose surface.
+        var driver = GalaxyDriverFactoryExtensions.CreateInstance("g", MinimalConfig);
+        driver.ShouldBeAssignableTo<ITagDiscovery>();
+        driver.ShouldBeAssignableTo<IReadable>();
+        driver.ShouldBeAssignableTo<IWritable>();
+        driver.ShouldBeAssignableTo<ISubscribable>();
+        driver.ShouldBeAssignableTo<IRediscoverable>();
+        driver.ShouldBeAssignableTo<IHostConnectivityProbe>();
+    }
+
+    [Fact]
+    public async Task GetHostStatuses_AfterInitWithSeam_ReturnsEmptySnapshot()
+    {
+        // PR 4.W wire-up assertion: when InitializeAsync skips the production-runtime
+        // build (seam injected), no transport-forwarder or probe-watcher pushes a
+        // status, so the aggregator snapshot is empty. The forwarder + watcher have
+        // their own unit tests in PR 4.7.
+        using var driver = new GalaxyDriver(
+            "g", BuildOptions(), hierarchySource: null, dataReader: null,
+            dataWriter: null, subscriber: new NoopSubscriber());
+        await driver.InitializeAsync(MinimalConfig, CancellationToken.None);
+        driver.GetHostStatuses().ShouldBeEmpty();
+    }
+
+    [Fact]
+    public void DriverType_IsGalaxyMxGateway_NotLegacyGalaxy()
+    {
+        // Must match GalaxyProxyDriver's DriverType ("Galaxy") side-by-side without
+        // collision so DriverInstanceBootstrapper can resolve both factories.
+        var driver = GalaxyDriverFactoryExtensions.CreateInstance("g", MinimalConfig);
+        driver.DriverType.ShouldBe("GalaxyMxGateway");
+    }
 }

tests/ZB.MOM.WW.OtOpcUa.Server.Tests/ZB.MOM.WW.OtOpcUa.Server.Tests.csproj

@@ -13,7 +13,7 @@
         <PackageReference Include="xunit.v3" Version="1.1.0"/>
         <PackageReference Include="Shouldly" Version="4.3.0"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0"/>
-        <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.3"/>
+        <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.7"/>
         <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.0"/>
         <PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Client" Version="1.5.374.126"/>
         <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2">