pub fn fold_to_edges<T>(ranked: Vec<T>) -> Vec<T>Expand description
Deal an already-ranked (best-first) sequence to alternating ends: best at the top, second at the bottom, third just inside the top, and so on.
This is the Lost-in-the-Middle placement separated from the ranking.
order_by_value pairs the two, ranking by raw score; a host with its own
reranker, per-provider quotas, or a trust weighting should rank the frames
itself and call this directly, because ranking across providers by raw
score is a policy choice and not a protocol guarantee (SPEC.md ยง6.6, F10).