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fix(fuegomux): address review comments — content negotiation, configurable strict mode, SetDefaultStatusCode no-op

- Body() now supports full Content-Type negotiation (JSON, XML, YAML,
  URL-encoded, plain text, octet-stream) via fuego's exported Read*
  functions, matching the core framework's behavior.
- DisallowUnknownFields is now configurable through fuego.ReadOptions
  instead of being hardcoded.
- SetDefaultStatusCode is a no-op since raw http.ResponseWriter can't
  delay WriteHeader — documents that option.DefaultStatusCode is
  unsupported for gorilla/mux.
- Adds tests for XML, URL-encoded, and default-JSON body parsing.