Feature: Update Exo state during run

Currently, skills and exo are behind an `Arc` which means there's no mutating them
There's 3 options here:

1. Store them behind an `Arc<Mutex>` so we can mutate the data
2. Don't store them inside an `Arc` which will involve more cloning when sending them to the UI
3. Once we change the state, reparse from the file system