gsh/command/router

The router module intercepts user input to check for built-in shell commands.

Before sending input to the dynamic evaluator (which would try to compile and execute it as Gleam code), the REPL passes the input here. If it matches a known command (like :h for help, :cc for hot-reloading, or :c for clearing the screen), the router flags it for immediate execution and tells the shell to skip evaluation.