Function plan 

pub fn plan(
    repo: &Repo,
    cfg: &Config,
    tracker: i64,
    body: &str,
    home: &str,
) -> Vec<Step>

What spar would do with each unchecked item, deciding but never writing.

Reads only: the state of an issue an item already names, and the similarity search for one that does not. spar triage prints exactly this and the acting path applies it, so the preview and the run cannot drift apart.