Returns the current state of a signup request. Poll at the returned pollAfterSeconds cadence; once status is completed the response carries customerId, consoleUrl and signInUrl. The response never includes the requester's email or the verification code. A browser must send the Signup-Result-Token returned by verifySignupRequest to read results after email verification. Without it, the request remains pending until its consent window expires. Agents may read results after the matching authenticated human explicitly approves their request.