Agent Skills: flutter-layer-based-clean-architecture

Enforce inward dependency flow, pure domain layers, and DTO-to-entity mapping in Flutter DDD architecture. Use when structuring lib/domain/, lib/infrastructure/, lib/application/, or lib/presentation/ layers, defining repository interfaces, or wiring BLoCs with get_it. (triggers: lib/domain/**, lib/infrastructure/**, lib/application/**, dto, mapper, Either, Failure)