feat: show how much of the raw repo map fits in the token budget

[jbellis]

this helps the user make a more informed choice about whether to override --map-tokens

[paul-gauthier]

I'm not sure it's that useful to compare to the size of the "full" repo map. The goal isn't to include "all" the repo map. But to include a highly relevant portion that doesn't use too many tokens.

[jbellis]

That's true, and it does work well when you have the right files added as a starting point. I'm using this for when you are trying to find the right place to start. Unless you have a good intuition already for how many tokens your map should take, it's useful to have an indication when the repo map is only a small fraction of the code and hence increasing map-tokens could help the LLM give a more useful answer to /ask instead of hallucinating.