Matrix is a swarm-wide service — one homeserver, not one per hive — so
its `enable` defaults from `swarm.enableRequiredServices` rather than
being flipped on its own. That toggle is off by default, so matrix is
off by default exactly as before; what changes is that a host declaring
"the swarm's services live here" gets the homeserver with it.
The forge needs no equivalent: it is mandatory and deploys with
hyperhive itself, so it has no enable to derive.
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