fix(scripting): only timeouts are quarantine strikes; alarm Bad annotation once per bucket change (fix round 1 I1, I3)

- I1 ScriptRunGuard: a run refused because the previous one is still
  executing is a Bad publish plus otopcua.script.run_refused, and no longer
  a quarantine strike. Only a timeout (and an allocation breach) counts;
  a refusal neither adds to nor resets the timeout streak; a completed run
  (value or throw) resets it. On a 1 Hz trigger with a 2 s budget a single
  4 s overrun is one timeout plus two refusals and must not quarantine.
  Tests updated across the guard, the alarm engine, the Calculation
  evaluator and the VT evaluator, plus
  Refusals_neither_count_toward_nor_reset_the_timeout_streak.
- I3 ScriptedAlarmEngine: the quality bucket is tracked only after the
  predicate completes (or in the inputs-not-ready path), so the tracked
  bucket is the last one annotated. A refused or quarantined predicate
  used to re-track the input bucket Good before the attempt and then flip
  it Bad, emitting QualityChanged on every push. The run-guard tests now
  count emissions (exactly 1 across N pushes, refused and quarantined
  cases), with a healthy sibling's dispatch count as the positive control
  that every push was processed. Both were red before the fix.

Refs #734

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

src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynVirtualTagEvaluator.cs

@@ -35,7 +35,7 @@ namespace ZB.MOM.WW.OtOpcUa.Host.Engines;
 ///     <b>Run quarantine.</b> Every compiled run goes through one <see cref="ScriptRunGuard"/> keyed by
 ///     virtual-tag id with the expression as the source identity: a run is refused while the tag's previous
 ///     (timed-out, abandoned) run is still executing, and the tag is quarantined after three consecutive
-///     non-completions or an allocation-budget breach. Both surface as <see cref="VirtualTagEvalResult.Failure"/>
+///     timeouts (a refusal is Bad but not a strike) or an allocation-budget breach. Both surface as <see cref="VirtualTagEvalResult.Failure"/>
 ///     so <c>VirtualTagActor</c> publishes Bad exactly as it does for a timeout. A quarantine lifts when the
 ///     expression changes, on <see cref="ClearCompiledScripts"/> / <see cref="ResetQuarantines"/> (the deploy
 ///     boundary), never by itself.