artifact: core/router/src/main/kotlin/com/correx/core/router/model/RouterResponse.kt
purpose: Define RouterResponse as a serializable data class holding the inference output content and a steeringEmitted flag for the server protocol.
depends_on: task-007
non_goals: Implementing facade logic, defining protocol message types
done_when: RouterResponse compiles as @Serializable and is accessible from the server protocol layer