Add back deleted files from the main branch
    
    To further reduce the diff with the main branch, let's add back the
    deleted files from the main branch branch. Note that while we add
    back the files, we don't add them back to the spec itself, so they'll
    exist but won't be used.
    
    Adding the files back allows us to merge changes from the main branch
    into the hyperscale branch without running into merge conflicts because
    the file was modified in the main branch but we deleted it. It also
    makes it easier at a glance to compare the diff from the hyperscale
    branch with the main branch since the diff will be smaller.
    
    The files were taken from commit 46a40810, which is the commit that
    c8s-hyperscale-sig was based on for the 249-4 release.