`check-docs-drift.sh` matches on the `PUNKTFUNK_*` shape, which cannot tell an
environment variable from a cbindgen-exported ABI constant — so exporting
`PUNKTFUNK_CLIENT_CAP_KEEP_HOST_AUDIO` read as a new undocumented knob and
turned the job red. Every sibling is already listed for exactly this reason:
the four other `CLIENT_CAP_*`, all eight `HOST_CAP_*`, all eight
`VIDEO_CAP_*`. This one goes beside them, in sort order.
It is not documentation debt being waved through. The bit's user-facing half
is the "Keep host audio playing" row, already written up in client-settings.md
and pointed at from the `PUNKTFUNK_AUDIO_OUTPUT_MODE` table; the embedder's
half is the doc comment cbindgen carries into the header. There is no
configuration surface here to document, because there is no variable.
enricobuehler
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