The rebase brought a convention guard that refuses a route.ts exporting POST
outside campaignJsonMutationRoute, and it named all four WebAuthn routes. They
now come from the shell, so the same-origin check is structural rather than
copied, and postJson delegates to postCampaignJson — keeping only what the
ceremonies add on top: the envelope's discriminant decides instead of the
status, and a non-JSON response reads as one sentence while a network failure
still propagates untouched. The two *-options routes have no body, hence
campaignWebAuthnNoBodySchema.
WebAuthn platform passkeys: opt-in enrollment after a password login, a
password-less sign-in that mints the same 14-day campaign-token, and
revocation from the profile. The session is minted through Payload's public
pieces (checkLoginPermission, addSessionToUser, getFieldsToSign, jwtSign)
inside a transaction with an advisory lock, so a passkey login neither
bypasses a lockout nor evicts the account's other sessions. The rpID is
derived from NEXT_PUBLIC_SITE_URL and resolves to null when the request host
disagrees, so previews never offer a ceremony the browser would refuse.
