Run `hg debug-repair-issue6528` server-side
See Mercurial bug6528
Even though Heptapod has never and never will ship Mercurial 5.8, there is a possibility that a corrupted filelog could have been pushed by a 5.8 client.
It could be part of the housekeeping task, or perhaps a separate Rake task, I'm open to suggestions.
Depends on #541 (closed) (5.7.1 does not have this debug/repair command, obviously)