087cae5d35
The relibc-consumer ABI sweep looped over the whole shared repo/*.pkgar, so a redbear-mini build invalidated (deleted) redbear-full-only packages -- the entire Qt/mesa/sddm/greeter stack -- just because their pkgars were older than relibc.pkgar. Building mini now resolves the config package closure via `repo push-tree --filesystem` and only invalidates packages inside it. Build mini, touch mini; full artifacts are never collateral. No env flag needed for the common case.