Should we go through and add the code-golf tag to the 30-some questions that need it?
(I'm not arguing they should be tagged as such, I'm saying we should make a clean-up effort and add that tag)
This has been done. 7 questions remain that don't have code-golf as a tag, 5 of which are closed. Of these, one of the open ones is atomic-code-golf, and the other open question is Tips for creating polyglots and doesn't need any scoring tags.
Of the closed ones:
Best place for learning GolfScript? is a recommendation question, off-topic.
Tips for King of the Hill bots is closed as too broad.
https://codegolf.stackexchange.com/questions/110631/data-structure-for-time-constraint-and-memory-constraint is a recommendation/SO-type question.