Feature Based Clean Architecture. Part 4: FBCA: Formalizing Responsibility Boundaries in a NestJS Module

An architectural doctrine for NestJS projects: a breakdown of typical codebase degradation scenarios and the structural constraints that keep them from emerging as the feature set grows. For three parts we've watched how an "ordinary" NestJS project arrives at forwardRef and the rest of the wall. It's time to answer the question, "how not to do this." This is the moment to say "Clean Architecture" — and immediately offer a caveat. Anyone who has read about it for more than five minutes knows: th