Does Craft/Twig help with cache-busting js/css? Usually, I would use PHP to append the filetime of a file provide cache-busting. Does Craft or Twig do anything that can help with this?
No, Craft/Twig itself doesn't really do anything in regards to cache busting your assets. Bust is one tool, and you'd also want to take a look at the awesome Minimee plugin port.