- Policy tests: use Fixtures where applicable; create_custom_field() fix in custom_field_value. - Replace unused actor with _actor, remove unused alias Accounts in policy tests. - profile_navigation_test: disable Credo for intentional TODO comment.
- Add policies block with HasPermission for read/create/update/destroy - Add authorizers: [Ash.Policy.Authorizer] to CustomField resource - Add custom_field_policies_test.exs (read all roles, write admin only) - Fix CustomField path in roles-and-permissions doc (lib/membership)
