The PERMISSIONS matrix only listed the POST /api/acks entry (parse-999
ingest). The GET list + detail endpoints for 999 / TA1 / 277CA acks
were missing, so the matrix_gate (default-deny) returned 403 to every
authenticated role, breaking the 999 ACKs / TA1 / 277CA inbox pages.
Add the three GET entries as ALL_ROLES — they're read-only metadata
surfaces that every authenticated operator needs to see. Add a
regression test that logs in as admin via the public route and
exercises the matrix; the existing test_existing_endpoints_require_auth
suite only checks the unauthenticated 401 path, which is why this slipped
through.
Fixes the live-verification 'Couldn't load ACKs from the backend /
forbidden' error reported against the UI.
tyler