expand_group inserted the group's own name into `resolved` (the package
accumulator), so a nested-group reference (kde-desktop -> dbus-services)
added a bogus "dbus-services" package. `repo cook --filesystem` then
failed with 'Package PackageName("dbus-services") not found'.
Track expanded GROUP names in a separate `expanded` set used only for
dedup/cycle short-circuit; only real leaf package names go into
`resolved`. Groups contribute their members, never themselves.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Red Bear OS
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