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2026-09-26: The vision-fidelity state machine: one leg per next(), in
Phase order: calibrate (measures the template overhead every geometry
cell subtracts), geometry, capability probes, integrity, concurrency, the
no-image control, then the score. The control runs after the legs it can
invalidate, so their cells are shown beside a VACUOUS verdict.
Owner: bench, vision. Invariants: none beyond the types.