neutralityScore
plain-language theorem explainer
The neutralityScore re-exports the eight-tick window sum of a real-valued signal. Researchers establishing shift-invariance for 8-phase schedules cite it when proving periodicity lemmas. The declaration is a direct alias to the SpiralField definition with no additional steps required.
Claim. For a signal $w : ℕ → ℝ$ the neutrality score at index $t_0$ is the sum $∑_{k=0}^7 w(t_0 + k)$.
background
The Flight.Schedule module implements an 8-tick control discipline and reuses neutrality predicates defined in SpiralField. The upstream SpiralField.neutralityScore computes exactly this eight-sample sum over consecutive indices. Related upstream definitions include Measurement.score, which returns a coherence ratio (listensPerSec / opsPerSec) when the denominator is nonzero, and the UniversalForcingSelfReference structure that records orbit-coherence axioms.
proof idea
One-line wrapper that aliases SpiralField.neutralityScore.
why it matters
The re-export supplies the basic diagnostic used by eightGateNeutral_shift_invariance and neutralityScore_shift1_of_periodic8. These lemmas establish that the eight-gate sum is invariant under unit shifts when the signal satisfies Periodic8. The construction sits inside the eight-tick octave (T7) of the forcing chain and supplies the concrete window sum required for 8-phase schedule proofs.
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