Please take another look. I don't love my code here...

On a more meta level, I'm also having trouble in framing the instructions for test authors. Specifically, I want to be able to say something like "please use the printed WPT command to reproduce", but the command as dumped will have multiple flags they probably don't want to use (i.e. --github-checks-text-file=/home/test/artifacts/checkrun.md and --affected base_head). So far I've changed it to a weaker sentence, but maybe I should be even more explicit, something like:

Please try to reproduce; see the above WPT command for what the bot ran, but note you may need to remove some flags to run locally.

Which is still confusing to test authors :/.

This is pretty exciting!

I don't have a great suggestion for showing the command that you should run to get things working locally without some terrible hack where you have a blocklist of flags to remove. We never quite managed to solve this issue for gecko ci (although in that case things are worse because the ci uses a totally different entrypoint compared to the local runs).