Joseph Doherty cd5540cb1a test(integration): F22 — failover scenario tests + harness Stop/Restart primitives ...

Extends TwoNodeClusterHarness with three lifecycle primitives:
- StopNodeBAsync()      — graceful CoordinatedShutdown (Cluster.Leave)
- RestartNodeBAsync()   — rebuild node B on same Akka port + same in-memory DB
- WaitForClusterSizeAsync(n) — converge assertion helper

Adds three failover scenario tests:
- Stopping node B shrinks cluster to 1 Up member
- Restarted node B rejoins on the same Akka port
- Deployment started with B down seals with a single NodeDeploymentState
  (validates ConfigPublishCoordinator.DiscoverDriverNodes snapshots
   membership at dispatch time)

Closes follow-up F22. Integration test count: 6 → 9 (+3).

2026-05-26 07:13:14 -04:00

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