Function state_dir 

pub fn state_dir(cwd: &Path, paralock_home: Option<&str>) -> PathBuf

Where Paralock keeps the local devnet’s state (devnet.json, swap stores, keys):

1. inside a Paralock checkout: <checkout>/.paralock, whatever PARALOCK_HOME says;
2. otherwise $PARALOCK_HOME (relative to cwd), when set and not empty;
3. otherwise ~/.paralock.