pub fn scan(now_secs: u64, ttl_secs: u64) -> Vec<RolloutSummary>Expand description
Every rollout whose last write is within ttl_secs of now_secs, parsed.
Walks only YYYY/MM/DD depth, so an unrelated file dropped in
~/.codex/sessions costs one read_dir rather than a recursive sweep.
Returns newest-first.