actions.py covers skip, donate, cart add/remove, subscriptions and vacation
holds. Every mutating endpoint on the site is guarded by rotating per-render
tokens, so each action re-derives them from a live page rather than storing
anything; skip additionally compares the date the server states in its
confirmation against the date it was asked to skip, and refuses on a mismatch.
All actions default to dry_run.
tools/compat.py records what the integration assumes about a site that offers
no API and no stability contract, and CI asserts it daily. Only the
unauthenticated surface is covered: checking the rest would mean putting a
personal account password in public repo secrets.
