Three review leftovers plus one inconsistency found while fixing them.
computePace returns undefined for a non-finite usedFraction instead of
letting NaN sail through the clamp into every pace field.
Daily-cache retention goes from 730 days to 3650: the cache is the only
durable record of carried days and lifetime now reads from it, so the
2-year prune would have replayed the lost-history bug in slow motion at
that horizon. Measured cost stays small (~2.3 MB / ~11 ms parse per 730
dense days).
The vercel-gateway dashboard-range test pins a relative day instead of
2026-06-01, which would have started failing once the rolling 6-month
window moved past it around December.
