test(archreview #10): cover actor-context preservation through the REAL CapabilityInvoker

The pass-through NullDriverCapabilityInvoker returns the call-site task directly, so it
never exercises the real invoker's internal `pipeline.ExecuteAsync(...).ConfigureAwait(false)`.
Adds a test-only Core reference to Runtime.Tests (the PRODUCTION Runtime assembly stays
Polly-free via the seam) and a discovery test that drives DriverInstanceActor through a real
CapabilityInvoker over a genuinely-yielding ITagDiscovery driver — proving the invoker's
internal ConfigureAwait(false) does NOT leak to the actor's own await, so the post-await
Context.Parent.Tell still runs (DiscoveredNodesReady arrives). Runtime.Tests 358, Core.Tests 238.

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DriverInstanceActorDiscoveryTests.cs

@@ -2,6 +2,7 @@ using Akka.Actor;
 using Shouldly;
 using Xunit;
 using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
+using ZB.MOM.WW.OtOpcUa.Core.Resilience;
 using ZB.MOM.WW.OtOpcUa.Runtime.Drivers;
 using ZB.MOM.WW.OtOpcUa.Runtime.Tests.Harness;
 
@@ -144,6 +145,38 @@ public sealed class DriverInstanceActorDiscoveryTests : RuntimeActorTestBase
         published.DriverInstanceId.ShouldBe(driver.DriverInstanceId);
     }
 
+    /// <summary>
+    ///     Arch-review #10: the SAME async-discovery context-preservation guarantee, but driven through the
+    ///     REAL <see cref="CapabilityInvoker"/> — whose Polly pipeline is awaited with
+    ///     <c>ConfigureAwait(false)</c> internally. This is the one path the pass-through
+    ///     <c>NullDriverCapabilityInvoker</c> (used by the sibling test) cannot cover: it returns the
+    ///     call-site task directly, so it never exercises the invoker's internal off-context await. If that
+    ///     internal <c>ConfigureAwait(false)</c> leaked to the actor's own <c>await _invoker.ExecuteAsync(…)</c>,
+    ///     the post-await <c>Context.Parent.Tell</c> in <c>HandleRediscoverAsync</c> would fault with
+    ///     "no active ActorContext" and no message would arrive. Its arrival proves the actor context survives
+    ///     the real resilience pipeline.
+    /// </summary>
+    [Fact]
+    public void Async_discovery_through_real_CapabilityInvoker_preserves_actor_context()
+    {
+        var pipelineBuilder = new DriverResiliencePipelineBuilder();   // real Polly pipeline, tier-A defaults
+        var invoker = new CapabilityInvoker(
+            pipelineBuilder,
+            driverInstanceId: "yielding-discoverable",
+            optionsAccessor: () => new DriverResilienceOptions { Tier = DriverTier.A },
+            driverType: "Stub");
+        var driver = new YieldingDiscoverableStubDriver();
+        var parent = CreateTestProbe();
+        var actor = parent.ChildActorOf(DriverInstanceActor.Props(
+            driver, rediscoverInterval: TimeSpan.FromMilliseconds(20), invoker: invoker));
+
+        actor.Tell(new DriverInstanceActor.InitializeRequested("{}"));
+
+        var published = parent.ExpectMsg<DriverInstanceActor.DiscoveredNodesReady>(TimeSpan.FromSeconds(5));
+        published.Nodes.Count.ShouldBe(3);
+        published.DriverInstanceId.ShouldBe(driver.DriverInstanceId);
+    }
+
     /// <summary>
     ///     The attempt cap bounds a discovered set that never stabilises: a driver whose set keeps GROWING
     ///     (1,2,3,…) never repeats its signature, so the loop is stopped only by

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

@@ -22,6 +22,10 @@
 
     <ItemGroup>
         <ProjectReference Include="..\..\..\src\Server\ZB.MOM.WW.OtOpcUa.Runtime\ZB.MOM.WW.OtOpcUa.Runtime.csproj"/>
+        <!-- TEST-ONLY reference to Core (Polly): lets the resilience-wiring guards construct the REAL
+             CapabilityInvoker. The PRODUCTION Runtime assembly stays Polly-free (consumes the
+             IDriverCapabilityInvoker seam) — this reference is in the test project only. -->
+        <ProjectReference Include="..\..\..\src\Core\ZB.MOM.WW.OtOpcUa.Core\ZB.MOM.WW.OtOpcUa.Core.csproj"/>
         <ProjectReference Include="..\..\..\src\Core\ZB.MOM.WW.OtOpcUa.Configuration\ZB.MOM.WW.OtOpcUa.Configuration.csproj"/>
         <ProjectReference Include="..\..\..\src\Core\ZB.MOM.WW.OtOpcUa.Commons\ZB.MOM.WW.OtOpcUa.Commons.csproj"/>
     </ItemGroup>