Implemented in mesh-controller #49 and mesh-host #24. One proposal was rejected on the
record's own terms: converging the hub is not made to wait on other machines' migrations.
Two birth-address outages and a registry that would have been the third; a
container that keeps a stale environment after its file changes; a host command
that applied a converged declaration to an adopted node; the hub and the vault
without seats. And the decision the operator made under it all: the hub adopts
the predecessor's tunnel in place, key and peers and range and port.
jschoubben