fix(siteruntime): arm stuck-script watchdog + health/summary on alarm runs (arch-review 2026-08-19 P1-3)

Alarm on-trigger runs (ScriptRunLauncher.RunAlarmScriptAsync) bypassed the
stuck-script watchdog, the script-error health counter, and
ScriptRunSummaryRecorder entirely, even though they run on the same bounded
ScriptExecutionScheduler pool as instance scripts. A wedged alarm body cost a
pool thread forever with no site event and no detach/replace, and a timed-out
or failed on-trigger run was invisible to health monitoring and the run
summary.

Bring the alarm path to parity with the instance-script path (RunScriptAsync):
capture the worker slot/run stamp in the first synchronous segment and arm
ArmStuckScriptWatchdog with the same detach-and-replace semantics and gauge;
resolve ScriptRunSummaryRecorder/ISiteEventLogger from the same DI provider and
thread RecordStarted/RecordCompleted/RecordFailed/RecordTimedOut; increment
ISiteHealthCollector.IncrementScriptError on both the timeout and general
failure catch blocks. LaunchAlarmScript/RunAlarmScriptAsync now take
healthCollector and serviceProvider parameters, passed from AlarmActor's
existing _healthCollector/_serviceProvider fields. No change to the
enqueue-anchored deadline, the shed cap, or "a stop does NOT cancel an
in-flight run" semantics.

Adds AlarmScriptWatchdogTests (previously zero coverage of LaunchAlarmScript):
wedged-worker detach + replacement, timeout-at-dequeue health counter
increment, and successful-completion summary recording. All three fail
against the pre-fix code (verified via stash) and pass after.

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/Actors/AlarmActor.cs

@@ -825,6 +825,11 @@ public class AlarmActor : ReceiveActor
                 // Context.Parent.Tell from the execution actor.
                 Self,
                 _logger,
+                // arch-review 2026-08-19 P1-3: same health collector + service provider as
+                // the instance-script path, so the alarm on-trigger run gets the same
+                // stuck-script watchdog, script-error counting, and run-summary threading.
+                _healthCollector,
+                _serviceProvider,
                 runId,
                 // Per-script timeout from the on-trigger script (null = global).
                 _onTriggerExecutionTimeoutSeconds,