The inline ci/ci aggregator green-lit the org-required check when a
needed job was SKIPPED (result 'skipped' is neither 'failure' nor
'cancelled'). Treat 'skipped' as a failure so a conditionally-skipped
required job can no longer pass the required check without running.
Contained inline fix; the audit's shared callable-ci-aggregate.yaml
(Stub 4) is deferred as it needs a new org-wide reusable workflow.
