A missing file walked every archive of the BIOS folder and every file of
its size: 3,000 ZIPs and 3,000 missing files took 186 s, now under 1 s.
--from copies and the owner of a refused file use the same lookups.
The size hint drew from every core of the system and named ares, which
loads no file of its own, so --core ares was refused. It now picks among
the names --core resolves against.
--check names why each flagged file is refused and where each core
opens it, and names a pack part missing from the folder from the
markers split_pack writes. --from-pack installs from a downloaded
pack or its parts with no network request, --manifest reads a saved
file list, both checking every hash. The end of a run names the
system or core that pulls most of the download when narrowing saves
over half.