forgejo's F3 federation subsystem resolves its data dir relative to
the binary, which under nixos lands at /run/current-system/sw/bin/data/f3
(read-only nix store) and fatals the daemon at boot. we don't
federate; turn it off.
avoids fighting an operator-side `services.forgejo` over the
singleton module options. container shares host netns
(`privateNetwork = false`) so agents still dial the forge via
plain `localhost:<httpPort>` and the host firewall is the only
layer that matters. container name is `hive-forge` (no `h-`
prefix) so hive-c0re's lifecycle scanner ignores it — operator
manages it with the standard `nixos-container` CLI. state lives
at `/var/lib/nixos-containers/hive-forge/var/lib/forgejo/` and
survives restarts.
new `services.hive-forge.enable` (off by default) wraps
`services.forgejo` with hyperhive-friendly defaults: sqlite (no
extra db service), built-in ssh on 2222 so it doesn't fight the
host's openssh, http on 3000 (outside hyperhive's 7000/8000/8100-8999
ranges), registration off (operator seeds agent users), private
repos by default. exported as `nixosModules.hive-forge` — operator
imports it on the host alongside hive-c0re. container-side wiring
(MCP tools or a bind-mounted token) is deferred; containers already
share the host netns so they can reach http://localhost:3000 today.
