TEMPORARY, and inert unless set. Bisecting a Performance score means a build between every
measurement, and rendering all 48 routes to change one of them is most of the wait.
FOFOS_BUILD_ONLY is passed through to the site's build script, which renders only the listed paths and
— the part that is not optional — skips the prune at the swap. The swap deletes anything in dist/ that
the run did not stage, so a one-page build would otherwise take every other page of the live site with
it, 404 until the next full build.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>