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Organization relays that enforce NIP-FI (federated identity) require a `Nostr-Federated-Identity` assertion on `/query`. The iOS notification service extension signed its `/query` with NIP-98 only, so the relay answered `401` and every push from an enforcing organization relay showed the generic "You have a new message." body. The app already mints these assertions in Dart from its organization account session, but that session lives in the app's own keychain, and assertions last minutes, so a cached one is useless by the time a push arrives. This change lets the extension mint its own: - **App:** whenever the organization `BuilderlabAccountClient` adopts or clears its session, the app writes or deletes a device-only keychain item in the group it already shares with the extension. The item holds the organization origin, the session credential and the organization's exact relay hosts (from `BUZZ_ORGANIZATION_RELAYS`). Builds without an organization never write it. - **Extension:** for a community whose relay host is one of those exact hosts, `BuzzRelayAssertionIssuer` requests an assertion from the organization issuer (`/api/goose/v1/buzz/identity/assertions`, session credential plus NIP-98 with the community's account key, the same request the app makes), checks it was issued for that key, and caches it in-process until 30 seconds before expiry. Both `/query` paths (message lookup and sender/channel enrichment) send it. Other relays get no header and never see the session. - Signing out awaits removal of the shared copy and fails if removal fails; each restore that finds no session retries the removal. - If issuance fails or the user is signed out, the extension sends the query without the header and the relay refuses it, which keeps today's generic fallback. Not covered here: relay-hosted avatars on enforcing relays still load without the assertion (the notification text and title are unaffected), hosted Builderlab communities, and Android. ### Validation Added tests: - `testOrganizationRelayQueriesCarryMintedAssertion`: against a stub relay that answers `401` without the assertion, two organization pushes resolve with message body and sender name from a single issuance, a non-organization relay gets neither the header nor the session, and after sign-out the notification falls back. Removing the header from the query path makes this test fail. - `testOrganizationAssertionIssuanceFailuresSendNoHeader`: refused, wrong-key, expired and header-injection responses produce no header. Subdomains and other ports of the organization relay host are never sent the session. - `builderlab_account_test.dart`: the shared copy follows exchange, restore and clear; a failed removal fails sign-out, and the next restore retries it. Focused existing validation: the full BuzzPushKit suite, the hosted Dart tests, `flutter analyze`, and an iOS device build of the app and extension. Not yet validated: a live push from the Block relay on a device. ## Before merge Live device push test: waived by Tom (2026-11-03). 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>