The Aura “system” package, which combines a system skeleton and the Aura libraries into a full-stack framework, was released today at 1.0.0 stable. This makes it formally ready for production use (although it has been in production use informally for the past year or so).
You can now start an Aura project with a single Composer command:
composer create-project aura/system /path/to/your/project
Take a look at the installation instructions for more information.
It feels great to have both stable, decoupled, truly independent package libraries and a system that integrates them into a framework. Many, many thanks to everyone involved who helped get us to this point.