We still need to decide what "archiving" eest entails. The repo will still be used for release tarballs and maybe re-purposed to publish test releases as JSON as source, so that client teams can git submodule it in their repos.

• "delete" source? Just add a note to the readme guiding people to execution-specs and explaining that client teams will still find release tarballs here?
• close all PRs
• ensure no open issues: handled by chore: move remaining issues to execution-specs execution-spec-tests#2201