BORN RULE = BOND FORMULA (2026-03-27)

D_e = (pi/d^2) * E_harm * cos^2(theta)

sigma: theta=0 deg, cos^2=1.000 (face normal of d-cube)
pi:    theta=45 deg, cos^2=0.500 (face diagonal) = cos(pi/d) ONLY at d=3
delta: theta=54.7 deg, cos^2=1/3 (body diagonal) = 1/d

cos^2(45) = cos(pi/d) is a UNIQUE d=3 identity.
C_BOND = pi/d^2 = two atoms each projecting 1/d onto bond axis.
8 corrections = angular corrections to cos^2 from orbital geometry.
Entanglement, bonding, measurement = same physics on the d-cube.
