The region at the end let earlier Host lines win over the mesh's (research 027/03). A
roster fact cannot be placed at the start, so the region holds one Include of config.d,
and the hosts are config.d/00-mesh, read first. Eight tools; authorized_keys and
known_hosts stay found until the controller holds those facts.
A package has one owning module, and sshd already owns openssh on every node — assigning
ssh-client was refused for both declaring it, and the refusal left every node unresolvable
until it was unassigned. Owning it was wrong besides: unassigning ssh-client would have
removed the package sshd serves from. The client binary ships in the package sshd holds.
Requires openssh; creates ~/.ssh (0700, owned by the operator account via
${machine:account}); writes every other node's Host block (HostName + User
<account>) into a marked region of ~/.ssh/config (home-scoped, into:block), so
`ssh <node>` reaches each peer as the right account and the operator's own
config is kept. Universal-tier: assigned wherever a person logs in; a node with
no account gets no config.
jochen
jschoubben