My person opinion on the best outcome here is:
- The "N packages built successfully and everything looks great" messages would go in as "Checks" -- super low interruption because there's nothing actionable for the PR author to do, just an additional green check mark.
- The "M packages failed to build successfully and here are the logs" messages would go in as a comment, like they do now. Using a red X is too high pressure for me -- maybe my bot ran out of disk space or something, and I don't want to be putting Xs on peoples PRs. I'm just a random person on the internet.
- The "Here are some suggestions on how you could improve your PR" comments -- I personally think these should go in as a comment, just like they are now, that's minimized by default and you have to click that little triangle to open it, and I should only post it once per PR maximum (in the same comment as the build failure if there are any build failures, otherwise in its own comment)