- IRIS_PUSH_BACKEND now defaults to ntfy (keeps push metadata on your own infrastructure); FCM is opt-in via IRIS_PUSH_BACKEND=fcm - build_push_backend(): ntfy for empty/unknown names, FCM only on explicit 'fcm' - gateway setup: warn when FCM is chosen (metadata routed via Google's servers) - README: privacy note + dedicated push section; new docs/playstore-listing.md with the FCM/ntfy privacy note for the Play Store listing - docs: 00/02/03/08/12/16 + setup.md updated to ntfy-default wording - tests: default-backend assertion updated (86/86 pass)