The slot rule counted work in flight but had no shape for its most common
wait: the round passed, state:needs-human set, the human's merge pending.
Shape 4 names it, the handoff round summary is its declaration, and shape
2 now covers the round awaiting its first verdicts so the live and passed
rounds are sequential and non-overlapping (#109).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
