Thanks for bringing this up. I agree settling on a convention would be good.
I’m actually more concerned with the human-readable names than with the filenames, though, as that’s what 98% of users sees. Our conventions from human-readable to filename are pretty good, so once we’ve agreed on the name (i.e CSL title) we should be able to settle on the filename quickly.
As a note, as we currently use the filename as ID, changing a lot of high-use style filenames isn’t great. @Dan_Stillman has requested (reasonably imo) that we convert IDs to UUIDs that remain stable, but the way I’m thinking about versioning this would be 1.2 or 2.0