ci(#606): Gitea-compatible trx upload + deterministic fixes for the CI-load test flakes

- v2-ci.yml: upload-artifact@v4 -> @v3 + continue-on-error (act_runner reports as GHES and
  v4 refuses GHES, failing every run); runner-capacity diagnostic step; AKKA_TEST_TIMEFACTOR=3
  on the test step.
- Runtime/ControlPlane harnesses: akka.test.timefactor from AKKA_TEST_TIMEFACTOR
  (TestTimeFactor), single-expect-default 15s; ControlPlane gains PresenceBudget.
- Leaked spinner threads: the infinite-loop timeout tests (Calculation, Host.IntegrationTests
  RoslynVirtualTagEvaluator, 3x Core.Scripting) pinned a core for the rest of the test process
  (abandoned, never stopped). Now a bounded 5 s wall-clock spin; outer compile-inclusive bound 30 s.
- Real test races fixed: ScriptedAlarmEngine push-during-drain (Inactive is also the start
  state + persist-before-update => wait for the Cleared save); DriverReconnectE2e (both nodes
  host the driver; Created[] is last-writer-wins and ForceReconnect is a no-op while
  Connecting); ControlPlaneStarterOrder (lost-race heal waited for a 60 s refresh tick).
- Fixed sleeps -> poll-for-condition: ReconnectSupervisor LastError, Modbus deadband steps
  (wait for observed reads), Modbus dispose hygiene precondition, FOCAS probe-loop log.
- Short presence budgets -> PresenceBudget in the Runtime/ControlPlane tests seen failing on
  Gitea; Calculation Settle 10 -> 30 s. No assertion removed, nothing skipped.
- infra/README.md §10 CI; stale TreatWarningsAsErrors comment in Directory.Build.props.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DriverHostActorDbLessTests.cs

@@ -88,7 +88,7 @@ public sealed class DriverHostActorDbLessTests : RuntimeActorTestBase
     private IActorRef? ResolveChild(IActorRef parent, string name)
     {
         var id = Sys.ActorSelection(parent.Path / name)
-            .Ask<ActorIdentity>(new Identify(name), TimeSpan.FromSeconds(3))
+            .Ask<ActorIdentity>(new Identify(name), PresenceBudget)
             .GetAwaiter().GetResult();
         return id.Subject;
     }
@@ -96,7 +96,7 @@ public sealed class DriverHostActorDbLessTests : RuntimeActorTestBase
     /// <summary>Blocks until the actor has processed a message — proving PreStart has run.</summary>
     private void AwaitStarted(IActorRef actor)
     {
-        var id = actor.Ask<ActorIdentity>(new Identify("started"), TimeSpan.FromSeconds(5))
+        var id = actor.Ask<ActorIdentity>(new Identify("started"), PresenceBudget)
             .GetAwaiter().GetResult();
         id.Subject.ShouldBe(actor);
     }
@@ -129,8 +129,8 @@ public sealed class DriverHostActorDbLessTests : RuntimeActorTestBase
 
         actor.Tell(new DispatchDeployment(deploymentId, RevA, CorrelationId.NewId()));
 
-        coordinator.ExpectMsg<ApplyAck>(TimeSpan.FromSeconds(5)).Outcome.ShouldBe(ApplyAckOutcome.Applied);
-        AwaitAssert(() => cache.Stores.Count.ShouldBe(1), duration: TimeSpan.FromSeconds(3));
+        coordinator.ExpectMsg<ApplyAck>(PresenceBudget).Outcome.ShouldBe(ApplyAckOutcome.Applied);
+        AwaitAssert(() => cache.Stores.Count.ShouldBe(1), duration: PresenceBudget);
         fetcher.Calls.ShouldBe(1);
     }