The internal CLI tool of aqua.
We develop aqua-proxy for aqua, and we don't assume that aqua-proxy is used in the other purpose.
Basically the user of aqua don't have to know the detail of aqua-proxy.
aqua-proxy is installed to $AQUA_ROOT_DIR/bin/aqua-proxy automatically when aqua install and aqua exec is run, so you don't have to install aqua-proxy explicitly.
aqua-proxy has only the minimum feature and responsibility.
aqua-proxy is stable an isn't changed basically.
aqua-proxy is developed to decide the version of aqua and package managed with aqua dynamically according to the aqua's configuration file when the package is executed.