Slidev is markdown, so i do it in html comments. Usually something like:

    <!-- TODOCLAUDE: Split this into a two-cols-title, divide the examples between -->

or

    <!-- TODOCLAUDE: Use clipart skill to make an image for this slide -->

And then, when I finish annotating I just say: "Address all the TODOCLAUDEs"

Thanks for sharing this method - such an elegant way to add annotations to generated specs!