validate-family.py and bootstrap.py: the holder's remedies, typed as printed in order, put a .gitmodules gone from the work tree back once and never over another remedy's write, stage it before a gitlink's git rm and after a section written back, and name a checkout git mv moved before the update, and bootstrap fails where git's init in this holder stopped with every member checked out, so no remedy undoes another or exits 128 (#879) - #889