AuxilliaryArchives are mostly infrastructure classes, to have global access acorss multiple wars etc, we place them in ear/lib. With a war they are in WEB-INF/lib.
I think Warp currently assumes it will be deployed in a War so it can use Servlet 3.0 web-fragment to be discovered by the container.
It should hook in somewhere else to register that. Perhabs as a ProtocolProcessor.