Every few years, a team runs into the same wall. Their discount logic, eligibility checks, and fraud thresholds have become load-bearing code. They can't change a rule without touching a deployment. A sprint ticket. A code review. Someone's weekend. So they go looking for a rules engine. They implement Drools. Or they write their own YAML-driven decision tree. Or they drop Camunda into the stack. And two years later, the discount logic is still owned by engineering — it's just written in a...