Both the option description and docs/swarm.md listed the forge among the
services whose `enable` defaults from `swarm.enableRequiredServices`.
It has no `enable`: it is the canonical store for the meta flake and
every agent's config repo, so it deploys with hyperhive itself.
The distinction is worth stating rather than deleting — a reader who
sees matrix and authelia listed and the forge absent would reasonably
wonder whether the forge is per-hive. It isn't; it's mandatory.
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