The kernel is maintained in a source tree rather than directly in dist-git. The specfile is maintained as a template in the source tree along with a set of build scripts to generate configurations, (S)RPMs, and to populate the dist-git repository.

The documentation for the source tree covers how to contribute and maintain the tree.

If you're looking for the downstream patch set it's available in the source tree with "git log master..ark-patches" or online.

Each release in dist-git is tagged in the source repository so you can easily check out the source tree for a build. The tags are in the format name-version-release, but note release doesn't contain the dist tag since the source can be built in different build roots (Fedora, CentOS, etc.)