The previous gather used `sorted(glob, key=lambda p: p.stat().st_mtime)`.
A transient OSError (race with delete, permission flicker, EBADF on a
weird filesystem) on any single file raised through the lambda and 500-ed
the whole page.
Reworked: stat each path under try/except into a (path, stat) list, sort
the already-statted entries. Bad files drop silently from the listing.
Regression test test_profile_sessions_page_tolerates_stat_failures
patches Path.stat to raise on one of two files, asserts the page returns
200 with the good row rendered and the bad row dropped.
952dc9e74d