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/CalculationDependencyFlowTests.cs

@@ -82,7 +82,7 @@ public sealed class CalculationDependencyFlowTests : RuntimeActorTestBase
             published.ShouldContain(e => e.FullReference == "calc/engine/out" && Equals(e.Snapshot.Value, 42.0));
             // Leg 2 — calc-of-calc: A's 42 re-entered the mux → B computes 43 on calc/engine/b.
             published.ShouldContain(e => e.FullReference == "calc/engine/b" && Equals(e.Snapshot.Value, 43.0));
-        }, TimeSpan.FromSeconds(5), TimeSpan.FromMilliseconds(100));
+        }, PresenceBudget, TimeSpan.FromMilliseconds(100));
     }
 
     /// <summary>
@@ -128,7 +128,7 @@ public sealed class CalculationDependencyFlowTests : RuntimeActorTestBase
             mux.Tell(new DriverInstanceActor.AttributeValuePublished("src-drv", "src/a", 2.0, OpcUaStatus.Good, Ts));
             published.ShouldContain(e => e.FullReference == "calc/keep" && Equals(e.Snapshot.Value, 20.0));
             published.ShouldContain(e => e.FullReference == "calc/remove" && Equals(e.Snapshot.Value, 7.0));
-        }, TimeSpan.FromSeconds(5), TimeSpan.FromMilliseconds(100));
+        }, PresenceBudget, TimeSpan.FromMilliseconds(100));
 
         // ---- REDEPLOY (in-place ApplyDelta) ----
         // New authored set: "keep" script EDITED to src/a*1000; "add" is a NEW tag reading a NEW dep src/b;
@@ -156,7 +156,7 @@ public sealed class CalculationDependencyFlowTests : RuntimeActorTestBase
             published.ShouldContain(e => e.FullReference == "calc/add" && Equals(e.Snapshot.Value, 150.0));
             // (c) edited script produces the NEW result: 3 * 1000 = 3000 (NOT the pre-edit 3 * 10 = 30).
             published.ShouldContain(e => e.FullReference == "calc/keep" && Equals(e.Snapshot.Value, 3000.0));
-        }, TimeSpan.FromSeconds(5), TimeSpan.FromMilliseconds(100));
+        }, PresenceBudget, TimeSpan.FromMilliseconds(100));
 
         // (b) the removed tag never recomputes on the post-redeploy src/a=3 (it would be 3 + 5 = 8) and the
         // edited "keep" never serves the stale *10 result (3 * 10 = 30). Give any errant compute a moment to land.