Flow 2 hardcoded offline_access in the scope string, but providers
like AWS Cognito don't support this scope (they handle refresh tokens
via client config). This caused invalid_scope errors on the Astrolabe
semantic search enablement flow.
Only include offline_access when enable_offline_access is explicitly
set, matching the behavior of DCR scope registration.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>