Applying a directory-sync effect that would demote the org's last Owner
(a
group remap, or a provision) previously threw and 500'd the settings
save. Now
rbac.setUserRole reports code:"last_owner" and applyEffect skips just
that
member (they keep Owner) while the rest of the batch applies.
Adds the machine-readable RoleAssignmentResult.code to the plugin
contract so
callers can tell the last-owner guard apart from a real failure.
Oskar Otwinowski
4be32d411c