spring-rest

Implements the REST API layer of a use case (UC-XXX) in a Spring Boot application: @RestController endpoints on top of the service layer, request and response DTO records, @Valid input validation, error mapping to RFC 9457 Problem Details with a @RestControllerAdvice, a status code per alternative flow, and paging. Takes the base path and contract style from the API contract section of docs/architecture/stack.md; holds no business rule the service does not enforce. Use when the user asks to "build the REST API", "create an endpoint", "expose the use case over HTTP", "add a controller", "map errors to Problem Details", or mentions @RestController, @RequestMapping, DTOs, ProblemDetail, RFC 9457, status codes, or a JSON contract for a separate client such as Angular. Normally run by /use-case-implement after the service layer; it can also be run directly.