A switch that changed `hive-tls-ca` stopped and started it, and the stop
propagated through `Requires=` to the store's container (sealed again under
the shamir seal), every container binding the bundle, and every
`<name>-ca-bundle` unit with its consumers. `reloadIfChanged` with the same
script as `ExecReload` rewrites the bundle in place and restarts none of them.
`Requires=` stays, so a failed assembly still keeps them from starting.
With `swarm-services-root.pem` missing, `hive-tls-ca` writes an empty bundle
and every `<name>-ca-bundle` unit fails. Its log line now names the root's
path. docs/swarm/ca.md describes both.
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