Function brief 

pub fn brief(repo: &Path, limit: Option<usize>) -> ExitCode

Boot-read: the live user-ruled decisions and the roads they rejected. A near-zero-cost, 0-network read (read_all only; no git, no receipts) for a fresh agent to load the decisions it must respect and the options it must not re-propose. Ordered most-recent-first (by held_since), capped to the effective limit, with an honest remainder footer.