Add a Go converter in a separate tooling module and reintroduce swagger.yaml as generated Swagger 2.0 output. Preserve schema property order, examples, and generator extensions, and reject unsupported constructs. Use the union of response media types for Swagger's operation-wide produces lists. Leave historical versioned specifications and generated Go models unchanged. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>