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* Add push notifications support * fix(notifications): address push notification review findings - Gate the capability endpoint's apple_push availability on the admin delivery toggle, matching web push: Available now means setup will actually deliver. - Reject direct admin writes to push_relay_deployment_id/api_key; the relay issues them as a pair during registration and a lone write desyncs them (and poisons the next rotation request). - Purge a device's registrations under other profiles when it re-registers, so a profile switch on a shared device stops the old profile's pushes (attempts cascade); adds a DB-backed test. - Extract the shared channelDispatcher core + retry sweep and rebuild the webhook/web push/Apple push dispatchers on it instead of keeping three copies of the worker-pool/retry loop. - Deduplicate relay URL validation (admin setting + register flow) and the push outbox attempt-building loops behind shared helpers. - Cap free-text decline reasons in notification display bodies. - Fix TestHandleApplePushDisplayDB expectations to match the shared display copy (test previously failed under SILO_TEST_DATABASE_URL). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(notifications): route push relay URL writes through registration only Direct writes to notifications.push_relay_url via the admin settings endpoint bypassed the relay registration flow, letting the stored URL drift out of sync with the deployment id / API key pair the relay minted for it. Reject the URL alongside the deployment id and API key in the settings handler; POST /admin/notifications/push/relay/register remains the only path that persists all three together. The admin UI's Relay URL field now edits local draft state and is applied by the Register/Rotate action instead of the settings save. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>