feat(gateway): forward operator credentials on alarm acknowledgement

Claude-Session: https://claude.ai/code/session_016J6isfcgqy4SB2RK3ZvFvT

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Workers/WorkerProcessLauncherTests.cs

@@ -22,6 +22,7 @@ public sealed class WorkerProcessLauncherTests
         WorkerLaunchEnvironment.EventQueueCapacity,
         WorkerLaunchEnvironment.AlarmPollIntervalMilliseconds,
         WorkerLaunchEnvironment.MaxAlarmsPerFetch,
+        WorkerLaunchEnvironment.AlarmAckClientName,
     ];
 
     /// <summary>Verifies that a valid worker executable starts with correct bootstrap arguments and nonce environment variable.</summary>
@@ -75,6 +76,10 @@ public sealed class WorkerProcessLauncherTests
             "1024",
             processFactory.LastStartInfo.Environment[
                 WorkerLaunchEnvironment.MaxAlarmsPerFetch]);
+        Assert.Equal(
+            "MxGateway",
+            processFactory.LastStartInfo.Environment[
+                WorkerLaunchEnvironment.AlarmAckClientName]);
         Assert.All(
             RequiredLaunchEnvironmentVariables,
             variable => Assert.True(
@@ -86,6 +91,28 @@ public sealed class WorkerProcessLauncherTests
         Assert.Equal(0, metrics.GetSnapshot().WorkersRunning);
     }
 
+    /// <summary>Verifies a configured AckClientName reaches the worker environment.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
+    [Fact]
+    public async Task LaunchAsync_WithConfiguredAckClientName_ExportsItToTheWorkerEnvironment()
+    {
+        using TestDirectory directory = TestDirectory.Create();
+        string executablePath = directory.CreateWorkerExecutable(machine: 0x014c);
+        FakeWorkerProcessFactory processFactory = new(new FakeWorkerProcess(processId: 1234));
+        WorkerProcessLauncher launcher = CreateLauncher(
+            executablePath,
+            processFactory,
+            new SucceedingStartupProbe(),
+            ackClientName: "Plant-Ack");
+
+        using WorkerProcessHandle handle = await launcher.LaunchAsync(CreateRequest());
+
+        Assert.NotNull(processFactory.LastStartInfo);
+        Assert.Equal(
+            "Plant-Ack",
+            processFactory.LastStartInfo.Environment[WorkerLaunchEnvironment.AlarmAckClientName]);
+    }
+
     /// <summary>
     /// Verifies that a configured <see cref="WorkerOptions.EventQueueCapacity"/> — not the shipped
     /// default — is what reaches the worker, so the option is deployable without a worker rebuild.
@@ -265,10 +292,12 @@ public sealed class WorkerProcessLauncherTests
         int startupTimeoutSeconds = 30,
         int startupProbeRetryAttempts = 3,
         int startupProbeRetryDelayMilliseconds = 250,
-        int eventQueueCapacity = 10000)
+        int eventQueueCapacity = 10000,
+        string ackClientName = "MxGateway")
     {
         GatewayOptions options = new()
         {
+            Alarms = new AlarmsOptions { AckClientName = ackClientName },
             Worker = new WorkerOptions
             {
                 ExecutablePath = executablePath,