Optional payload bundles live here.

Examples:
  modules/
  addons/

Each optional bundle should contain package.json and a files/ directory with the copy payload.

For module bundles the recommended layout is:
  modules/<bundle_id>/package.json
  modules/<bundle_id>/files/modules/<ModuleName>/*

The builder may also populate files/ for optional core modules from the CMSMS source tree
while leaving this folder as the metadata authority outside the installer runtime.
