Requirements:

1. mairu exec should perform arbitrary command completion and forward completion for other (external) commands
2. mairu exec should perform completion for --server, and role positional argument depending on --server

Barriers:

1. clap_complete does not support ValueHint::CommandWithArguments in dynamic mode
2. dynamic mode is required to perform completion for --server and role arguments

🤷🏻

We need to end up with hand-written completion for now? 🤔