2024.06's admin refuses to serve behind a resolver that does not
validate DNSSEC — found live as an unhealthy admin, 454s on submission
and a 500 webmail, with the runtime's forwarder validating nothing. The
unbound this module always shipped becomes reachable: pinned at the
predecessor's own address on the module network (the subnet the mesh
adopted), and named as dns by the nine containers that resolve anything.
Stands on mesh-host #26, which gave the vocabulary these two fields.