Phase 0 — mechanical rename ZB.MOM.WW.LmxOpcUa.* → ZB.MOM.WW.OtOpcUa.*

Renames all 11 projects (5 src + 6 tests), the .slnx solution file, all source-file namespaces, all axaml namespace references, and all v1 documentation references in CLAUDE.md and docs/*.md (excluding docs/v2/ which is already in OtOpcUa form). Also updates the TopShelf service registration name from "LmxOpcUa" to "OtOpcUa" per Phase 0 Task 0.6.

Preserves runtime identifiers per Phase 0 Out-of-Scope rules to avoid breaking v1/v2 client trust during coexistence: OPC UA `ApplicationUri` defaults (`urn:{GalaxyName}:LmxOpcUa`), server `EndpointPath` (`/LmxOpcUa`), `ServerName` default (feeds cert subject CN), `MxAccessConfiguration.ClientName` default (defensive — stays "LmxOpcUa" for MxAccess audit-trail consistency), client OPC UA identifiers (`ApplicationName = "LmxOpcUaClient"`, `ApplicationUri = "urn:localhost:LmxOpcUaClient"`, cert directory `%LocalAppData%\LmxOpcUaClient\pki\`), and the `LmxOpcUaServer` class name (class rename out of Phase 0 scope per Task 0.5 sed pattern; happens in Phase 1 alongside `LmxNodeManager → GenericDriverNodeManager` Core extraction). 23 LmxOpcUa references retained, all enumerated and justified in `docs/v2/implementation/exit-gate-phase-0.md`.

Build clean: 0 errors, 30 warnings (lower than baseline 167). Tests at strict improvement over baseline: 821 passing / 1 failing vs baseline 820 / 2 (one flaky pre-existing failure passed this run; the other still fails — both pre-existing and unrelated to the rename). `Client.UI.Tests`, `Historian.Aveva.Tests`, `Client.Shared.Tests`, `IntegrationTests` all match baseline exactly. Exit gate compliance results recorded in `docs/v2/implementation/exit-gate-phase-0.md` with all 7 checks PASS or DEFERRED-to-PR-review (#7 service install verification needs Windows service permissions on the reviewer's box).

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

tests/ZB.MOM.WW.OtOpcUa.Client.UI.Tests/AlarmsViewModelTests.cs

@@ -0,0 +1,141 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Client.Shared.Models;
+using ZB.MOM.WW.OtOpcUa.Client.UI.Services;
+using ZB.MOM.WW.OtOpcUa.Client.UI.Tests.Fakes;
+using ZB.MOM.WW.OtOpcUa.Client.UI.ViewModels;
+
+namespace ZB.MOM.WW.OtOpcUa.Client.UI.Tests;
+
+public class AlarmsViewModelTests
+{
+    private readonly FakeOpcUaClientService _service;
+    private readonly AlarmsViewModel _vm;
+
+    public AlarmsViewModelTests()
+    {
+        _service = new FakeOpcUaClientService();
+        var dispatcher = new SynchronousUiDispatcher();
+        _vm = new AlarmsViewModel(_service, dispatcher);
+    }
+
+    [Fact]
+    public void SubscribeCommand_CannotExecute_WhenDisconnected()
+    {
+        _vm.IsConnected = false;
+        _vm.SubscribeCommand.CanExecute(null).ShouldBeFalse();
+    }
+
+    [Fact]
+    public void SubscribeCommand_CannotExecute_WhenAlreadySubscribed()
+    {
+        _vm.IsConnected = true;
+        _vm.IsSubscribed = true;
+        _vm.SubscribeCommand.CanExecute(null).ShouldBeFalse();
+    }
+
+    [Fact]
+    public void SubscribeCommand_CanExecute_WhenConnectedAndNotSubscribed()
+    {
+        _vm.IsConnected = true;
+        _vm.IsSubscribed = false;
+        _vm.SubscribeCommand.CanExecute(null).ShouldBeTrue();
+    }
+
+    [Fact]
+    public async Task SubscribeCommand_SetsIsSubscribed()
+    {
+        _vm.IsConnected = true;
+
+        await _vm.SubscribeCommand.ExecuteAsync(null);
+
+        _vm.IsSubscribed.ShouldBeTrue();
+        _service.SubscribeAlarmsCallCount.ShouldBe(1);
+    }
+
+    [Fact]
+    public void UnsubscribeCommand_CannotExecute_WhenNotSubscribed()
+    {
+        _vm.IsConnected = true;
+        _vm.IsSubscribed = false;
+        _vm.UnsubscribeCommand.CanExecute(null).ShouldBeFalse();
+    }
+
+    [Fact]
+    public async Task UnsubscribeCommand_ClearsIsSubscribed()
+    {
+        _vm.IsConnected = true;
+        await _vm.SubscribeCommand.ExecuteAsync(null);
+
+        await _vm.UnsubscribeCommand.ExecuteAsync(null);
+
+        _vm.IsSubscribed.ShouldBeFalse();
+        _service.UnsubscribeAlarmsCallCount.ShouldBe(1);
+    }
+
+    [Fact]
+    public async Task RefreshCommand_CallsService()
+    {
+        _vm.IsConnected = true;
+        _vm.IsSubscribed = true;
+
+        await _vm.RefreshCommand.ExecuteAsync(null);
+
+        _service.RequestConditionRefreshCallCount.ShouldBe(1);
+    }
+
+    [Fact]
+    public void RefreshCommand_CannotExecute_WhenNotSubscribed()
+    {
+        _vm.IsConnected = true;
+        _vm.IsSubscribed = false;
+        _vm.RefreshCommand.CanExecute(null).ShouldBeFalse();
+    }
+
+    [Fact]
+    public void AlarmEvent_AddsToCollection()
+    {
+        var alarm = new AlarmEventArgs(
+            "Source1", "HighAlarm", 500, "Temperature high",
+            true, true, false, DateTime.UtcNow);
+
+        _service.RaiseAlarmEvent(alarm);
+
+        _vm.AlarmEvents.Count.ShouldBe(1);
+        _vm.AlarmEvents[0].SourceName.ShouldBe("Source1");
+        _vm.AlarmEvents[0].ConditionName.ShouldBe("HighAlarm");
+        _vm.AlarmEvents[0].Severity.ShouldBe((ushort)500);
+        _vm.AlarmEvents[0].Message.ShouldBe("Temperature high");
+    }
+
+    [Fact]
+    public void Clear_ResetsState()
+    {
+        _vm.IsSubscribed = true;
+        _vm.AlarmEvents.Add(new AlarmEventViewModel("Src", "Cond", 100, "Msg", true, true, false, DateTime.UtcNow));
+
+        _vm.Clear();
+
+        _vm.AlarmEvents.ShouldBeEmpty();
+        _vm.IsSubscribed.ShouldBeFalse();
+    }
+
+    [Fact]
+    public void Teardown_UnhooksEventHandler()
+    {
+        _vm.Teardown();
+
+        var alarm = new AlarmEventArgs(
+            "Source1", "HighAlarm", 500, "Test",
+            true, true, false, DateTime.UtcNow);
+        _service.RaiseAlarmEvent(alarm);
+
+        _vm.AlarmEvents.ShouldBeEmpty();
+    }
+
+    [Fact]
+    public void DefaultInterval_Is1000()
+    {
+        _vm.Interval.ShouldBe(1000);
+    }
+}