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State

As we add more commands, the Pokedex needs more shared state. We'll keep that state in a config struct and pass it to every command callback.

This gives every command access to the same state and lets us extend the program without changing every callback again later.

Assignment

Create a config struct for state shared by the REPL and its commands.
Update the cliCommand.callback field to accept a *config parameter and return an error.
Update the REPL to accept a *config and pass it to command callbacks.
Store the command registry in config so commands can access it through the shared state.
Update the help and exit callbacks to accept the new parameter.
Initialize the config in main and pass it to the REPL.

The program should behave exactly as it did before. This is a refactor, so don't add a new command yet.

Run and submit the CLI tests from the root of the repo.