v0.38.4 — the README described the behaviour v0.38.3 replaced

It still claimed a fetch failure or a missing section fails the job, one release
after both became warnings that render 'unknown'. That paragraph is the one
explaining why the badge can be trusted, so it is a bad place to be stale.

Now a table of the three outcomes, plus why the third warns rather than fails.
The release gate also asserts the README mentions 'unknown' when the workflow
can render it — narrow on purpose, since a grep cannot police prose.