List the published plan ladder

The plans a customer can buy, with prices, included credits and usage limits.

Anonymous: the pricing page renders before login. Identical for every caller, so nothing here is account-scoped.

Prices come from the active published catalogue version — what a new signup would be sold. An existing account keeps resolving against the version it was sold on, which is reported by GET /v2/users/me/entitlements instead.

Enterprise is not listed: it is a custom contract rather than a self-serve rung.

Feature availability is not published on this endpoint. The catalogue grants every feature to every tier, which contradicts the advertised per-plan feature matrix — and it is not even accurate about the backend any more, since API access is gated by a tier floor in module.plans.api_access rather than through the catalogue. Publishing the catalogue's view would put a wrong claim next to a correct price. The field is added when a version publishes real floors.