And another one!! Nested-visibility checker. As I wrote earlier today: this...

And another one!! Nested-visibility checker. As I wrote earlier today: this one does not exist yet. I recorded it as an issue on the packwerk-extensions repo: https://github.com/rubyatscale/packwerk-extensions/issues/37

These semantics:

```
packs/a VIOLATION
packs/b OK
packs/b/packs/d OK
packs/b/packs/e ENFORCE_NESTED_VISIBILITY: TRUE
packs/b/packs/e/packs/f VIOLATION
packs/b/packs/e/packs/g VIOLATION
packs/b/packs/h OK
packs/c VIOLATION
```

https://github.com/rubyatscale/packwerk-extensions/pull/38
https://github.com/rubyatscale/visualize_packs/pull/58

these are the PRs to land the new checker and to add it to visualization tooling.

Oh, and I went with "folder visibility" instead of "nested visibility"

Published.