Software engineering meta-router — 12 frameworks (Scientific Debugging, Bisection, Observability/USE-RED, Hexagonal Architecture, Domain-Driven Design, Event Sourcing/CQRS, Modular Monolith, SOLID, 12-Factor, Resilience Patterns, Strangler Fig, Team Topologies). Real Korean growth scenarios (Toss, Kakao, Coupang, Naver) and regulatory context (FSC, 전자금융업 electronic finance business rules, PG integration). Invoke /code.