The row 197 r8 D5 proof stopped on a leftover hold-add stub. G23 and G13 write release, finish and
remove the test dir before the stub polls again, so the stub looped forever on sshd's side. 4 runs
of the file left 7 stubs. Both hold loops now also stop once $D is gone.
Candidate 4d99c178b, approved by Webby in round 1 (rev 2883, webby-0080). Gate on Sage's slot
13:05-13:07Z: the whole file 3 runs at 37/0 with no stub left, bus 596/0, and a mutant that drops
the hold-add check leaves 2 stubs. The late remote add the leak exposed is row 249 (#1751).