Module command_handler 

REPL command dispatcher - handles all : prefixed commands.

Commands

Command	Description
:help	Print all available commands
:stdlib	List all stdlib modules
:stdlib <mod>	List all functions in a stdlib module
:save <file>	Save all ValidInput lines to a file
:load <file>	Print a file’s contents into the output
:attach <file>	Lex, parse, and evaluate a file into the env
:detach <file>	Remove a file from the attached list
:exit	Exit the REPL

Note: :detach removes the file from the tracked list but does not undefine variables or functions already loaded into the evaluator environment.

Functions

handle_command

Dispatches a :command string, mutating output, evaluator, and attached as needed.