github prove unreachable (keybase.md)

**keybase url**
https://keybase.io/UndoneKittens

**public gist (keybase.md)**
https://gist.github.com/UndoneKittens/e179b74f1ccdfe5767a10a1d6d89ff6c

**keybase prove github**
```
...
Check GitHub now? [Y/n] y
Couldn't find posted proof.
```

gist is public, how to fix it? 🤔🤔🤔

Start by reproducing `keybase prove github` with the public keybase.md proof and the linked GitHub Gist. Check why the command reports that it cannot find the posted proof; done means the public proof is detected successfully or the failure is explained with a clear error.

Written by the indexing model from the issue text.