The lower grid completes: reach chart left, World card right. Two
headline levers (chance to forward, education budget as count plus
share) move instantly and rerun through the store's debounce; the
advanced disclosure holds students, friends per student, clique
tendency, first poster, and the three named seeds, each seed with a
dice reroll plus a Reroll world button (one coalesced run).
Engine 400s render inline under the card header in rose with the
offending field marked by name match; network failures keep using the
banner with retry. A graph-seed reroll remounts the network svg keyed
by graph hash, fading the new layout in over 200 ms.
