A card is decided only when a swipe event carries THIS section's id;
the lifetime swipes.action a second look wears into its section no longer
paints it as pre-decided. progress/undecided, report counts (latest
in-section event per listing) and maybe_exhaust all use the new
section_decided_ids() set; read path only, no writes. Every section_state
item carries decided_this_section; the FE counts server truth unless a
local intent is in flight, and sectDecided is clamped to sectTotal
everywhere (commit + paintSect) so the pill can never read past N/N.
Semantics note: completing a section now means striking EVERY item in it
(returns re-struck on their second look) — the exhaust selfcheck was
updated to strike all items, matching the deck's real flow. Undo-on-a-
return residual (event stays after the DELETE) is the accepted Q5 clamp-
only behavior, covered by a dedicated selfcheck case.
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