Allow to skip formatting code in specific cells

See specifically https://github.com/quarto-dev/quarto-cli/discussions/13335#discussioncomment-14464956

Discussed in https://github.com/quarto-dev/quarto-cli/discussions/13335

^{Originally posted by hfrick September 5, 2025}

Description

I'm preparing slides via quarto and generally use air to format my code. For some of the code cells, I'd like to skip the formatting. I can do that with air's # fmt: skip, but then it shows up on the resulting slide. Since these are workshop slides, I'd like to avoid this since it would probably be a distraction to learners. Is there a way to skip formatting specific cells without it showing on the slide? Would something like #| format: skip be possible?

I have seen https://github.com/quarto-dev/quarto-cli/discussions/12082 but I think it's related but different.