The four readers (matrix-token, queue-agent, grafana-oidc, otel-oidc) log
in against a cert-auth role that their own swarm-bao-*-policy unit writes.
They were ordered after swarm-bao-pki and the store's container but not
after that unit, so on an apply a reader could log in before its role
existed and be refused by `allowed_common_names` until a retry landed
after the role did.
After= plus Wants= on the policy unit, never Requires=: the policy unit
skips by ConditionPathExists once the bootstrap token is gone, and a
skipped unit counts as done for ordering.
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