Operator: uptime-kuma is maintained elsewhere — drop it from the weekly upgrade
but keep it in the used-recipes inventory. New cc-ci-plan/used-recipes.md is the
canonical list of every recipe cc-ci deploys/tests, with a weekly|external tier;
upgrade-all §1 now excludes 'external' rows from the candidate list (explicit
--args still override). uptime-kuma = external; all others weekly.
