When BUILD_VENUE=ci, init confirms tea/glab/gh/curl (or a custom
command) and writes .pouch/builder/ci-status.sh. wait_ci.sh only
polls that script and no longer guesses forge CLIs.
Project architecture lists belong in makefile.builder, not .env.builder.
deb/push-deb fan out when ARCH is omitted; Docker platforms derive from
ARCHES. Legacy makefiles without ARCHES keep the old single-arch behavior.