Per operator review (#1899): the hive's own domain should never be
typed by hand. Remove the --domain flag from peer-config and wg init
entirely; both now resolve it from the daemon (HostRequest::HiveDomain).
peer-config errors with a clear hint if the daemon can't answer; wg init
prints the peer block best-effort (skips it, still enables the mesh, if
unresolved). Regenerated docs/tools/hivectl-cli.md.
8ea19b3b12