Report booked cost, entitlement, token coverage, and work as three
series: work per measured token, work per measured+estimated token,
and work per euro. Months below 50% coverage are unfit for token
trends. There is no blended efficiency number.
Store mixed measured/estimated/superseded aggregates as session-token
evidence. Map kinds onto the evidence-basis vocabulary, keep unknown
months unknown, and refuse to post the snapshot as booked spend or
resource-control usage.
