v0.14.0

• Added: receiving_identity_status on domain responses (create, get, update,
  verify). pending, verified, failed, or null when the domain is not
  registered to receive mail yet. Point an MX at Mailtea only once it reads
  verified; it never gates status.
• Changed: automations.activate documents the no_verified_sender refusal.
  A 422 with that code means a send_email step has no sender it can send
  from; reason (NO_SENDER, DOMAIN_NOT_VERIFIED, WRONG_PURPOSE,
  DKIM_NOT_VERIFIED or INVALID_FROM) says which, and steps[] names every
  blocking step. Previously only automation_invalid was documented.
• Added: domains.update takes tracking_subdomain: null to remove a tracking
  subdomain. The domain's links go back to being served from the Mailtea host.
  Links in mail you have already sent point at the old hostname and stop
  resolving — there is no way to reinstate them. An empty string is not the same
  thing: it is refused with tracking_subdomain_invalid. null is accepted on
  update only; CreateDomainInput.tracking_subdomain stays a string.
• Changed: the MX row in records now reports what the last verify found,
  instead of reading pending on every request but the verify itself. A domain
  nobody has verified reads not_started.

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Released from mailtea-app/mailtea@fed0718.