The XEmacs Package Release Engineer is responsible for keeping the system coherent. The changes to packages/package-compile.el and packages/xemacs-packages/Makefile required to make the package available to others, and for building SUMO tarballs, etc, are done by the Package Release Engineer, not individual library maintainers.
The Package Release Engineer also maintains assorted infrastructure for
actually making releases. These are generally available for inspection
xemacs-builds module in the CVS repository.