Structured archive entry. The keeper: two bugs hid each other for a month. One
file's module-level sys.exit aborted pytest collection for the whole directory,
so the obvious command ran zero tests while 273 passed file-by-file — and that
invisibility concealed the file's own month-old red check, whose NAME was a
complete bug report about a soundcheck being counted as OPAL's first track.

A test nobody can see failing is worse than one that does not exist, because its
name reads as reassurance. Fixing the harness surfaced a real correctness bug at
no extra cost.