Neat.  First question: how do other contributors participate?

Hey Josh,

good question! The Fedora Atomic Workstation SIG has been doing bi-weekly
IRC meetings since we created it at devconf. Everybody is welcome to come
and participate. This page

has the details. Most of the SIG participants can be found in #atomic and
#fedora-workstation on freenode at other times, and those are good places
to discuss Atomic Workstation, or now, Silverblue.

We also have an issue tracker here:

And we are in the process of setting up a website for this initiative, which
will contain contact information for contributors as well as documentation and
other materials.

Other communication channels (e.g. a mailing list) may be added once
we got the website going.