The "AI Behavior" context is reported as a commit status (via
github.rest.repos.createCommitStatus) rather than a check run, but the
Code Admission gates only queried check runs via
github.rest.checks.listForRef. This caused every release to fail with
"missing: AI Behavior" since the context was never found.
Add a commit-status query after the check-run loop in both the preflight
and sealed-commit Code Admission gates. Statuses are merged only for
required contexts not already covered by a check run, preserving the
existing check-run precedence.