Repair signalled "reinstall me" by deleting the bootstrap marker. That was
already destructive -- repair is reachable from a transient backend error on a
fully working install -- and it stranded users in first-run setup with no way
back short of hand-writing the marker file.
Carry the intent in an explicit flag instead. Repair forces the next resolve
through the installer and clears itself once the reinstall starts, so a forced
reinstall still works without destroying provenance about how the install was
created.
Closes#72166
Brooklyn Nicholson
53707e405c