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expectedCost

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 170noncomputable def expectedCost {n : ℕ} (ψ : QuantumState n) : ℝ :=

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Definition body.

 171  Finset.univ.sum fun i => probability ψ i * totalCost (ψ.configurations i)
 172
 173/-- **BORN RULE INTERPRETATION**: The probability of a configuration is
 174    inversely related to its J-cost (cost-weighted selection).
 175
 176    In full RS, this is derived from the variational principle:
 177    The observed configuration minimizes expected J-cost subject to constraints.
 178
 179    Here we state the connection: lower J-cost configurations have higher probability
 180    in the cost-optimal distribution (analogous to Boltzmann: P ∝ exp(-βE)). -/

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