Design Value Objects for domain concepts and DTOs for data transfer with proper immutability (readonly) and validation
$npx -y skills add makfly/superpowers-symfony --skill value-objects-and-dtosInstalls into the current project.
Run `npx skills use "https://github.com/makfly/superpowers-symfony" --skill "makfly/superpowers-symfony/value-objects-and-dtos"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/makfly/superpowers-symfony" that are relevant to the current task. Run `npx skills add "https://github.com/makfly/superpowers-symfony"` and select the relevant skills, then follow their instructions.