Haar class scaling

For bulk states drawn from the Haar class (uniformly random pure states), the entropy disagreement scales as:

$\mathbb{E}|S_A - S_B| \approx 0.608 \cdot d_B^{-3/2} + \mathcal{O}(d_B^{-2})$

The prefactor 0.608 is analytic. No fitting. Simulations match. This is the regime relevant to black hole interiors and holographic codes for chaotic quantum dynamics.