The controller now accesses /var/lib/mesh-broker-tls (mesh-controller
#54) and the push refused whole: lavinmq declared the directory as an
owned resource, and shared data is the operator's, owned by no module
(ADR 0051). lavinmq only ever reads the certs — genesis laid them down
— so it declares a read access like the controller does, and the
directory belongs to nobody.