pub fn save(
root: &Path,
world: World,
vault: BTreeMap<String, String>,
) -> Result<WorldSaved, Error>Expand description
harness.v1.world.save: write a world into our own folder.
An existing root is loaded first: its io bookkeeping is what tells the
encoder which artifacts are unchanged, so a save of an unmodified world
leaves every byte alone. vault is merged into the loaded one — a caller
that sends no secrets keeps the home’s own .env.