[bartimus]

It makes sense to use a programming language for the rule logic. I'm just suggesting you need to conceptually separate the software code from the rule code. Have the rule code in a separate repository that can be deployed independently (by people with different roles). You can't just deploy new code. You'd perhaps want to apply previous versions of a rule.

In any case. The people maintaining/using the rules might not have a debugger available. They still need to have some kind of "rule stack trace" on how the system came to a certain answer.