The board audit checked Done from one side only — a card parked there for work
that never shipped — and so could not see an issue still OPEN under a Done card.
That is the normal way this breaks here: closing keywords do not fire on
`v2/main`, so every v2 issue is closed by hand after its PR merges, and
forgetting that step leaves exactly this state. No other check could catch it;
they either gate on `isopen` or skip `Done`. Predicate verified against a
fixture holding one open and one closed Done card.
Signed-off-by: cliffhall <cliff@futurescale.com>