`docs/tools/forge.md` said the flat forms "still work as hidden
back-compat aliases" and named `pr-create` and `pr-status` as its
examples. Both refuse now: nine flat verbs parse only far enough to
print the namespaced form that replaced them.
The doc had no way to be read correctly, because the seven that do still
work are hidden too and `--help` shows neither group. Naming the split
here is the only place the difference is visible.
At the enum the kind-agnostic seven now read as staying rather than as
"still work", and `credential-helper` is marked as belonging to neither
group: it is hidden because git invokes it, so a sweep reading
`hide = true` as "deprecated" would remove checkout auth.
Refs #3974.
529e9416c1