<!-- directive-density: intentional (teaches anti-patterns; NEVER markers describe real layering violations, not aspirational guidance) -- Architecture Patterns Consolidated architecture validation and enforcement patterns covering clean architecture, backend layer separation, project structure conventions, and test standards. Each category has individual rule files in loaded on-demand. Quick Reference | Category | Rules | Impact | When to Use | |----------|-------|--------|-------------| | Clean Architecture | 3 | HIGH | SOLID principles, hexagonal architecture, ports & adapters, DDD | | Pro…