Devel:: or Sub:: seem appropriate.

UPDATE: Oh, sorry, read over the part where you said 'script'. It looks like you need a new category there. But check out Module::Starter. It has a script called module-starter alongside which just calls the module. And it might be a good idea to similarily create a module for your code and just add a small script that then calls your module. That way others can expand on or use your code in their projects