Merge b647-ci: Gitea-compatible artifact upload + deterministic CI-flaky tests (#606)

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

infra/README.md

@@ -217,3 +217,31 @@ and a real directory (LDAP) — never the dev values in this doc.
 
 > The legacy Wonderware TCP/ArchestrA sidecar was retired; the historian backend is now the
 > `ZB.MOM.WW.HistorianGateway` sidecar (see §6 and `docs/Historian.md`).
+
+## 10. CI — Gitea Actions (`.github/workflows/v2-ci.yml`)
+
+The one workflow (there is no `.gitea/workflows/`) runs on the Gitea act_runners `gitea-runner` /
+`gitea-runner-2`: a `build` job (restore, Release build, `code-reviews/regen-readme.py --check`) and a
+`unit-tests` job (the whole solution minus `Category=E2E|LiveIntegration`, trx →
+`scripts/ci/assert-not-all-skipped.sh` → trx upload). Read run logs read-only with
+`tea api --login <login> /repos/dohertj2/lmxopcua/actions/runs` (then `…/runs/<id>/jobs`,
+`…/jobs/<id>/logs`).
+
+Things that are not obvious (#606):
+
+- **`actions/upload-artifact` is pinned to `@v3` and `continue-on-error`.** act_runner reports as GHES,
+  and `upload-artifact@v4+` refuses GHES outright (`GHESNotSupportedError`), which failed every run
+  regardless of the tests. Do not "upgrade" it back to v4.
+- **`AKKA_TEST_TIMEFACTOR=3` on the test step.** The Runtime/ControlPlane actor-test harnesses
+  (`tests/Server/*/Harness/TestTimeFactor.cs`) feed it to `akka.test.timefactor`, which dilates every
+  TestKit wait (explicit durations included). The leg runs every assembly at once on the runner; a long
+  tail of 2–8 s presence budgets each failed about one run in eight. Local runs stay at 1.
+- **Presence vs absence.** A presence wait (`ExpectMsg`, `AwaitAssert`, a poll-until) is a ceiling and
+  is sized from the suites' `PresenceBudget` (15 s); an absence window (`ExpectNoMsg`, settle-then-
+  assert) is the assertion itself and keeps its short literal. Replace a fixed `Task.Delay` before an
+  assertion with a poll for the condition.
+- **Never leave a script spinning.** A timed-out script is abandoned, not stopped
+  (`TimedScriptEvaluator`), so `while(true){}` pinned a core for the rest of the test process. Timeout
+  tests use a bounded wall-clock spin (`System.DateTime.UtcNow` is sandbox-allowed).
+- **`MIN_EXECUTED`** (`assert-not-all-skipped.sh`) is still the default `1`; raise it once a green run
+  is recorded (a full run executes ~12.7k tests across ~57 trx files).