UnrelateUserWhenArgumentNil used User :update which only accepts :email.
Switch to :update_user with member: nil so manage_relationship clears member_id.
- Member update_member: on_missing :unrelate → :ignore (no unlink when :user omitted)
- Test: normal_user update linked member without :user keeps link
- Doc: unlink only explicit (user: nil), admin-only; Actor.admin?(nil) note
- Check: defense-in-depth for "user" string key
- Forbid on :user argument presence (not value) to block unlink via nil/empty
- Defensive nil actor handling; policy restricted to create/update only
- Test: Ash.load with actor; test non-admin cannot unlink via user: nil
- Docs: unlink behaviour and policy split
Role: Ash policies (HasPermission); read for all, create/update/destroy admin only.
User–member link: only admins may set :user on Member create/update (ForbidMemberUserLinkUnlessAdmin).
- PermissionSets: Role read :all for own_data, read_only, normal_user; admin keeps full CRUD
- Role resource: authorizers and policies with HasPermission
- Tests: role_policies_test.exs (read all, create/update/destroy admin only)
- Fix existing tests to pass actor or authorize?: false for Role operations
