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#[AsCommand(name: 'app:migrate:users')]
final readonly class UserMigrator
{
    public function __construct(
        private LegacyRepository $source,
        private MessageBusInterface $bus,
    ) {}

    public function execute(): int
    {
        // 1. Secure Extraction
        $users = $this->source->fetchSecure();

        // 2. Transform to Modern Entity
        foreach ($users as $dto) {
            $msg = new ImportUserMessage($dto);
            $this->bus->dispatch($msg);
        }

        return Command::SUCCESS;
    }
}