One semantic conflict on the `all-checks-passed` verdict job. Master moved
it to `ubuntu-latest`; this branch had routed it through the failover
selector so a hosted-pool outage could not leave the required verdict
queued. Master's resolution satisfies that requirement more directly:
standard hosted capacity is independent of both custom pools, so the
verdict is reachable whichever pool is degraded, and the selector is no
longer needed. Kept `ubuntu-latest` and folded the failover reasoning
into its comment.
The failover runbook accordingly documents three failover jobs (the three
required Linux workers), not four, and states why the verdict stays on
standard hosted capacity in both states.
Chinesezjc
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