agcodex-linux-sandbox

This crate is responsible for producing:

• a agcodex-linux-sandbox standalone executable for Linux that is bundled with the Node.js version of the AGCodex CLI
• a lib crate that exposes the business logic of the executable as run_main() so that
  • the agcodex-exec CLI can check if its arg0 is agcodex-linux-sandbox and, if so, execute as if it were agcodex-linux-sandbox
  • this should also be true of the agcodex multitool CLI