Skill: hexagonal-architecture
Description: Design, implement, and maintain applications using hexagonal architecture (ports and adapters). Use when (1) designing new systems requiring clear separation between domain logic and infrastructure, (2) refactoring monolithic or tightly-coupled codebases toward cleaner boundaries, (3) reviewing architecture for dependency rule violations or layer leakage, (4) establishing testing strategies that isolate domain logic, or (5) evaluating whether hexagonal architecture suits a given problem domain.