For folks interested in the final result. After some hiccups, I was able to get things pushed and you can now find it here:
You’ll find that the repo is all the various stages I am morphing the Sportsball sample application through. The linked folder is a Rails app where one piece, namely the prediction of competition results is handled inside of a Hanami slice (it really comes down to one operation: package-based-rails-applications-book/c9s02/sportsball/slices/hanami_predictor/operations/create_prediction.rb at main · shageman/package-based-rails-applications-book · GitHub).
Thanks for all the help!