rsync --exclude also PROTECTS a path from --delete, so anything that reached the
publication tree before its exclude existed stayed there permanently - invisible
to the sync and surfacing only as a scrub-gate failure. That cost two rounds of
'add the exclude, still fails' on the installer bundle and again on
.pytest_cache. The generated paths are now purged before the sync, so adding an
exclude is sufficient on its own.
tests/test_docs_publishable.py assembles its search terms from fragments: a file
containing the literal strings the scrub greps for tripped that scrub on itself.
Excluding the file from publication would have removed the check from the
repository it protects.
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