spring-service

Implements the service layer of a use case (UC-XXX) in a Spring Boot application: @Service classes with constructor injection, @Transactional boundaries, the business rules with UC-XXX BR-YYY markers, domain exceptions for every rejection the API or UI turns into a message, and Bean Validation on the inputs. Calls the persistence layer only through the repository or port its Handover names, and supports both a flat single module and a hexagonal multi-module layout (domain record, business service, outbound port). Use when the user asks to "implement the service layer", "write the business logic", "enforce the business rules", "create a Spring service", "add transactions", or mentions @Service, @Transactional, domain exceptions, or the business module of a hexagonal Spring Boot project. Normally run by /use-case-implement after the persistence layer; it can also be run directly.