Auto: abcip-5.1 — HSBY paired-IP role probing

Closes #242

tests/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/AbCipHsbyRoleProberTests.cs

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+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Driver.AbCip;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests;
+
+/// <summary>
+///     PR abcip-5.1 — integration scaffold for HSBY paired-IP role probing. Skipped by default
+///     because <c>ab_server</c> cannot emulate a ControlLogix HSBY pair (it has no second-chassis
+///     concept + no <c>WallClockTime.SyncStatus</c> tag). Promoted from skipped to active when
+///     the Docker fixture grows the <c>hsby-mux</c> sidecar (planned in PR abcip-5.2 follow-up
+///     work) or when a real lab rig is available; the unit-level coverage in
+///     <c>AbCipHsbyTests</c> exercises the value-mapping + active-resolution rules in the
+///     meantime.
+///     <para>
+///     The skip lives in the test body so the file still compiles + the trait is discoverable
+///     by <c>dotnet test --filter "Category=Hsby"</c>; the body never gets to assert anything
+///     against <c>ab_server</c>.
+///     </para>
+/// </summary>
+[Trait("Category", "Hsby")]
+[Trait("Requires", "AbServer")]
+public sealed class AbCipHsbyRoleProberTests
+{
+    [AbServerFact]
+    public Task Role_prober_resolves_active_chassis_against_paired_fixture()
+    {
+        // ab_server cannot emulate an HSBY pair; the paired-fixture compose service +
+        // hsby-mux sidecar that PR abcip-5.2 ships will let this body do real wire work.
+        // For PR abcip-5.1 we keep the file as a scaffold so the integration trait is
+        // discoverable and a future PR can flip the skip into a real assertion.
+        Assert.Skip("HSBY paired-fixture (controllogix-secondary + hsby-mux sidecar) not yet wired — PR abcip-5.2 follow-up.");
+        return Task.CompletedTask;
+    }
+}