fix(scripting): quarantine a refusal behind a stuck orphan (fix round 2)

Ruling refinement on I1. Only timeouts are strikes, so a never-returning
while(true), which times out once and is then only refused, was never
quarantined, and that defeated E1. A refusal now quarantines immediately
when the orphan it was refused behind has been executing for longer than
ScriptingOptions.StuckOrphanQuarantineFactor x the script's timeout
(default 10, so 20 s at the 2 s default; 0 or less disables it). It uses
the same quarantine path: one Error, otopcua.script.quarantined with
reason=stuck, Bad, lifted on source change or redeploy. A young orphan
(a short overrun) is still a plain refusal.

The guard stamps the run's start (Stopwatch timestamp) when the pool
picks it up and clears it when the run really finishes.

Tests: the 30-trigger while(true) regression (paced) now ends
quarantined with reason "stuck", still with exactly one orphan and a
healthy sibling. Positive control: a 2x overrun is refused, not
quarantined, and evaluates again once the orphan completes. A factor of
0 disables the rule. Docs (ScriptEditor "Runtime safety", VirtualTags)
and the seam remarks are updated.

Refs #734

Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/ScriptedAlarmEngine.cs

@@ -76,7 +76,7 @@ public sealed class ScriptedAlarmEngine : IDisposable
     /// <summary>
     ///     Per-alarm run quarantine (keyed by alarm id, source identity = predicate source). Refuses a
     ///     predicate run while the alarm's previous (timed-out, abandoned) run is still executing and
-    ///     quarantines after three consecutive timeouts (a refusal is not a strike) or an allocation-budget breach — one orphan
+    ///     quarantines after three consecutive timeouts (a refusal is not a strike unless its orphan is stuck past StuckOrphanQuarantineFactor × the budget) or an allocation-budget breach — one orphan
     ///     per alarm instead of one per upstream push. Reset on every <see cref="LoadAsync"/> (a redeploy).
     /// </summary>
     private readonly ScriptRunGuard _guard;