More forgiving command checks

Very small one here, if a command is not entered exactly as it is registered when initialised, has a capital in it as a typo for instance ('Start' instead of 'start'), vorpal recognises the command as it shows help for that specific command but doesn't run it. Might be nice to have vorpal be more error forgiving for fat fingers :smile: Any ideas?

Start by tracing how Vorpal matches registered commands and how it handles the help path when a command differs in capitalization. Confirm the current behavior with a minimal command example, then add coverage showing that a capitalized typo such as "Start" is handled as intended while preserving exact command behavior.

Written by the indexing model from the issue text.