The use number read `work-class` from the order frontmatter; 0 of 690 orders
carry it, so the denominator was always empty. PM rule 02.10: the order
marker `<!-- loesningsvalg: plan|prove -->` is new work, `ikke-nytt` is not,
counted from 2026-09-28 (enforced by pre-order-loesningsvalg.sh since then).
Unmarked orders and orders before the start are "not measured", never a no.
Red against today's code: MARKER_SINCE is not exported, and with it stubbed in
a scratch copy all five new use tests fail on behaviour.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Kjell Tore Guttormsen
e2186bf64f