Testers signup in the Releases alternative; redoal_testers bucket

Desktop releases run free (the gitea_releases listing, no sign-up); a
'Join the public testers' form on the same alternative collects the
Apple ID for a TestFlight invite, recorded to redoal_testers. New
confirmation page /joined-testers, and an aggregates entry with
attended_by pointing at the n8n TestFlight onboarding automation
(events.redoal_testers.* → App Store Connect).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ByshXuDEzH8hXh5qp4VgGk

aggregates.yaml

@@ -38,3 +38,19 @@ aggregates:
       kept: { event: kept }
     transitions:
       open: [removed, kept]
+  # TestFlight beta signups (index.yaml's "Test it on your iPhone").
+  # Attended by automation, not a human desk: a new "requested" signup
+  # is handed to the App Store Connect API to invite the Apple ID to the
+  # closed beta; "withdrawn" (the /joined-testers self-transition) drops
+  # them from the invite list.
+  - bucket: redoal_testers
+    attended_by: >
+      n8n TestFlight onboarding workflow — ops/n8n/testflight-onboarding
+      in redoal/redoal. Consumes NATS events.redoal_testers.* and calls
+      App Store Connect POST /v1/betaTesters.
+    initial: open
+    states:
+      open: { event: requested }
+      withdrawn: { event: withdrawn }
+    transitions:
+      open: [withdrawn]