get:
  tags:
    - Health
  summary: Check API process liveness
  description: Returns stage and build SHA. ALB target-group probes call this without auth or a database ping.
  operationId: get-api-health
  security: []
  responses:
    "200":
      description: API process is up.
      content:
        application/json:
          schema:
            $ref: ../components/schemas.yaml#/HealthResponse
          example:
            stage: local
            sha: deadbeef
    "400":
      description: Bad request.
      content:
        application/json:
          schema:
            $ref: ../components/schemas.yaml#/Error
          example:
            error:
              code: VALIDATION_ERROR
              message: Bad request.
              correlationId: 11111111-1111-4111-8111-111111111111