how to deal with debug directory

Q: is the debug directory needed for the released version? Even for the trunk version, it looks like the checks are only happening for run3.

Q: What do sub-detectors use them for?

• for VP, from @tlatham: I personally use the debug files to be able to easily view and run checks on small parts of the Velo geometry as I modify them, and then to view and check how that modified part integrates into the whole Velo. !572 (comment 8207419)