Branch B (upstream-blocked): probed nuget.org for an xunit.v3 Akka TestKit —
Akka.TestKit.Xunit3 and Akka.TestKit.Xunit.v3 both return BlobNotFound (verified
2026-07-13), so the 3 holdouts (AdminUI/ControlPlane/Runtime.Tests) cannot migrate
off xunit v2 yet. Bumped the pin 2.9.2 -> 2.9.3 (latest 2.9.x) and moved the blocker
rationale + removal condition to a comment at the pin in Directory.Packages.props so
it lives at the version, not just in 3 scattered csprojs. All 3 suites green on 2.9.3
(514 + 63 + 364 tests).
Joseph Doherty
152d8ebe0e