Eval submodule - nanochat/tasks derived

[art-test-stack]

Using nanochat/tasks to eval model
For reproducibility, obtained from:

git clone git@github.com:karpathy/nanochat.git
git filter-branch --subdirectory-filter tasks -- --all
git remote remove origin
git remote add origin git@github.com:art-test-stack/nanochat-tasks.git

[art-test-stack]

forgot to git stash to anyone sees this lol