The "hive-forge container shape" section described the container
isolation model but omitted the port and firewall knobs that operators
need when exposing forge externally or overriding the Forgejo ROOT_URL.
Add two subsections:
"Network and port configuration" — covers httpPort (default 3000),
sshPort (default 2222), and openFirewall (default false, was previously
true — breaking change note included). Explains the shared-netns
rationale for why openFirewall is safe to leave off for agent use but
must be set for browser/external-git-client access. Clarifies that
forge.behindGateway obviates forge.openFirewall for HTTP reach.
"rootUrl override" — documents forge.rootUrl (default null) with the
auto-derivation table (behindGateway ? http://domain/ : http://domain:port/)
and explains when to override (TLS, https:// clone URLs, bespoke shapes).
Notes the auto-derivation always produces http://, so TLS operators must
set rootUrl explicitly.
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