http://www.slitaz.org/en/devel/index.html
Mercurial repositories

SliTaz Mercurial or Hg repos can be browsed or cloned by anyone using the URL: http://hg.slitaz.org/. People with write access can directly use repos.slitaz.org which requires authentication.

The contributor and the developers only can directly use repos.slitaz.org

If you want to make a package for slitaz you can sent it to the mailing list.
http://www.slitaz.org/en/mailing-list.html

The other interesting link that you should see:

http://tank.slitaz.org/
http://bb.slitaz.org/