I still like the idea but there is currently no use case to develop it anymore.
free as in freedom free software collection of system commands
Latest stable release is: 
The current change log can be found here
You can find some demo implementations ready to run here.
mkdir -p vendor/net_bazzline/php_component_command_collection
cd vendor/net_bazzline/php_component_command_collection
git clone https://github.com/bazzline/php_component_command_collection .
composer require net_bazzline/php_component_command_collection:dev-master
API is available at bazzline.net.
Star it if you like it :-). Add issues if you need it. Pull patches if you enjoy it. Write a blog entry if you use it :-D.