-`install.sh` and bootstrap's box fetch take `RIG_HOST` / `BOX_HOST` so a Forgejo origin can serve the install channel (#111). Archive candidates are host-only (`refs/tags` then `refs/heads` on every forge); box's raw fetch tries `/raw/tag/` then `/raw/branch/` and never guesses kind from spelling. `BOX_HOST` defaults through `RIG_HOST`.