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/DriverHostActorFetchAndCacheTests.cs

@@ -47,8 +47,8 @@ public sealed class DriverHostActorFetchAndCacheTests : 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);
         cache.Stores[0].RevisionHash.ShouldBe(RevA.Value);
         fetcher.Calls.ShouldBe(1);
     }
@@ -70,7 +70,7 @@ public sealed class DriverHostActorFetchAndCacheTests : RuntimeActorTestBase
             artifactFetcher: fetcher));
 
         actor.Tell(new DispatchDeployment(deploymentId, RevA, CorrelationId.NewId()));
-        coordinator.ExpectMsg<ApplyAck>(TimeSpan.FromSeconds(5)).Outcome.ShouldBe(ApplyAckOutcome.Failed);
+        coordinator.ExpectMsg<ApplyAck>(PresenceBudget).Outcome.ShouldBe(ApplyAckOutcome.Failed);
 
         Thread.Sleep(300);
         cache.Stores.ShouldBeEmpty();
@@ -78,7 +78,7 @@ public sealed class DriverHostActorFetchAndCacheTests : RuntimeActorTestBase
         // The revision was NOT advanced: a re-dispatch of the SAME revision fetches AGAIN rather than
         // short-circuiting as "already current". (Two fetch attempts prove #485's keep-last-known-good.)
         actor.Tell(new DispatchDeployment(deploymentId, RevA, CorrelationId.NewId()));
-        coordinator.ExpectMsg<ApplyAck>(TimeSpan.FromSeconds(5)).Outcome.ShouldBe(ApplyAckOutcome.Failed);
+        coordinator.ExpectMsg<ApplyAck>(PresenceBudget).Outcome.ShouldBe(ApplyAckOutcome.Failed);
         fetcher.Calls.ShouldBe(2);
     }
 
@@ -99,12 +99,12 @@ public sealed class DriverHostActorFetchAndCacheTests : RuntimeActorTestBase
             artifactFetcher: fetcher));
 
         actor.Tell(new DispatchDeployment(deploymentId, RevA, CorrelationId.NewId()));
-        coordinator.ExpectMsg<ApplyAck>(TimeSpan.FromSeconds(5)).Outcome.ShouldBe(ApplyAckOutcome.Applied);
+        coordinator.ExpectMsg<ApplyAck>(PresenceBudget).Outcome.ShouldBe(ApplyAckOutcome.Applied);
 
         // Re-dispatch the now-current revision: the _currentRevision guard short-circuits to an
         // immediate ACK without a second fetch.
         actor.Tell(new DispatchDeployment(deploymentId, RevA, CorrelationId.NewId()));
-        coordinator.ExpectMsg<ApplyAck>(TimeSpan.FromSeconds(5)).Outcome.ShouldBe(ApplyAckOutcome.Applied);
+        coordinator.ExpectMsg<ApplyAck>(PresenceBudget).Outcome.ShouldBe(ApplyAckOutcome.Applied);
 
         Thread.Sleep(200);
         fetcher.Calls.ShouldBe(1);