@dbeckwith great questions! I would suggest asking on the AP CSP teacher community on the college board website. There you can get official answers from the college board directly. I have done this when I needed clarification on "math" for the create.
Looking at page numbers 82 and 83 on the purple book, to me, your "suggestions" that you wrote above sounds a lot like helping students debug code. I would say that's a "no". BUT I would suggest students help each other debug code. It seems ok to say "Ask Jamie, about how she would approach your problem" to encourage collaboration. That seems entirely fair and in the spirit of the course.
To your second point, based on the fact that the college board says that "teachers may..."
I think your "overview" could be seen as whole class teaching of course content and skills.
Again, I think for the clearest and most definitive answers, I would go to the college board website and ask there. Based on the purple book, this is my interpretation.