setupArgParser method
Sets up the argument parser with command-specific options
Implementation
@override
void setupArgParser() {
super.setupArgParser();
argParser
..addOption('title', help: 'Feature display title.')
..addOption('description',
help: 'What the feature owns.', defaultsTo: 'A modular Vyuh feature.')
..addOption('route', help: 'Entry route (defaults to /<feature-name>).');
}