docs(alarms): note operator/IDE toggle drives the live subtag smoke test

C6a: the rig's TestAlarm attributes are object-driven; a flip script OR a manual
operator/IDE toggle drives them (confirmed live 2026-06-14). Update the how-to-run
comments and Skip reason accordingly.

src/ZB.MOM.WW.MxGateway.Worker.Tests/Probes/AlarmSubtagLiveSmokeTests.cs

@@ -16,9 +16,12 @@
 //   1. On the dev rig with AVEVA System Platform installed and Galaxy running:
 //      $env:MXGATEWAY_RUN_LIVE_MXACCESS_TESTS = "1"
 //   2. Remove (or set to null) the Skip parameter on the [Fact] below.
-//   3. Run with an alarm flip script (same one used by AlarmsLiveSmokeTests)
+//   3. Drive a TestMachine alarm so its Active/Acked subtags toggle — either an
-//      so that TestMachine_001.TestAlarm001 toggles its Active/Acked subtags
+//      alarm flip script (same one used by AlarmsLiveSmokeTests, ~10 s cadence)
-//      on a ~10 s cadence.
+//      or a manual operator/IDE toggle of the alarm attribute. The rig's
+//      TestAlarm attributes are object-driven, so an external MXAccess Write
+//      cannot toggle them (confirmed live 2026-06-14 by toggling TestAlarm002
+//      from the IDE).
 //
 // net48/x86 constraints:
 //   - No init-only properties, records, index/range operators, C# 8+ pattern
@@ -49,8 +52,9 @@ namespace ZB.MOM.WW.MxGateway.Worker.Tests.Probes;
 ///     <see cref="SubtagAlarmConsumer.AcknowledgeByName"/> writes the
 ///     ack-comment subtag (AckMsg) successfully.
 ///
-///     Skip-gated; flip <c>Skip=null</c> on the dev rig with the alarm flip
+///     Skip-gated; flip <c>Skip=null</c> on the dev rig with an alarm being
-///     script running. The remaining live-validation item is confirming that
+///     driven (flip script or a manual operator/IDE toggle of the alarm
+///     attribute). The remaining live-validation item is confirming that
 ///     the runtime MXAccess item reference path requires no intermediate
 ///     alarm-condition segment (i.e. <c>&lt;Object&gt;.&lt;AlarmAttr&gt;.InAlarm</c>
 ///     resolves as-is).
@@ -117,7 +121,7 @@ public sealed class AlarmSubtagLiveSmokeTests
     ///     the Degraded flag and synthetic GUID are stamped, then
     ///     AcknowledgeByName and verifies the ack-comment write returns 0.
     /// </summary>
-    [Fact(Skip = "Live dev-rig smoke test — flip Skip=null with AVEVA + an alarm flip script running. Subtag fallback path. Field names confirmed (InAlarm/Acked/AckMsg/Priority); live-validate runtime path resolves without intermediate alarm-condition segment.")]
+    [Fact(Skip = "Live dev-rig smoke test — flip Skip=null with AVEVA + an alarm being driven (flip script or manual operator/IDE toggle of the alarm attribute). Subtag fallback path. Field names confirmed (InAlarm/Acked/AckMsg/Priority); live-validate runtime path resolves without intermediate alarm-condition segment.")]
     public void SubtagFallback_FullPipelineRoundTrip_SynthesizesRaiseAndAcknowledges()
     {
         Exception? threadException = null;
@@ -342,9 +346,10 @@ public sealed class AlarmSubtagLiveSmokeTests
         consumer.Subscribe(subscriptionExpression);
         Log("Subscribe returned OK.");
 
-        // 1. Wait for a Raise transition.  The alarm flip script (same one
+        // 1. Wait for a Raise transition.  Whatever is driving the alarm — a
-        //    used by AlarmsLiveSmokeTests) writes the active subtag on a
+        //    flip script (same one used by AlarmsLiveSmokeTests, ~10 s cadence)
-        //    ~10 s cadence.  LmxSubtagAlarmSource delivers OnDataChange via
+        //    or a manual operator/IDE toggle — writes the active subtag.
+        //    LmxSubtagAlarmSource delivers OnDataChange via
         //    the Windows message pump on the STA, so we must pump messages
         //    here while we wait — mirroring how AlarmsLiveSmokeTests drives
         //    its WnWrapAlarmConsumer.PollOnce() from the STA in a tight loop.