Ok, so that's not just PROMPT_READY, that's every prompt...which might be ok. ? is a great optional cue, and you're thinking on 2 levels deep, 2nd level always being '.'?
Yep. The idea is to keep it short, but to still have something to say "there are more levels" in the stack, hence the one dot. Basically I just compressed your 4 level proposal, and added a separator to deal with the preceding stuff and suggest the conditional.
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