We study the exponent-level structure of zero-density estimates for theRiemann zeta function around the Guth-Maynard bound A(sigma) = 4 route. Third, the extremal rational-concentration scenario is verified to be asimultaneous fixed point of four independent constraint families, includinga Rudin-Chang bound over the Q-dissociated log-prime system; a universalheight law B = T_1^(1/3) emerges across the whole range. Finally a single Alignment Hypothesis on linear-form correlations ofmollified Möbius coefficients is isolated and its exact price computed: ityields A(3/4) <= 420/191 but leaves the uniform exponent 30/13 invariant. All exponent arithmetic is verified in exact rational arithmetic. No newunconditional zero-density exponent is claimed; the contribution is thecertification of optimality for the stated inputs, the barrier map, and theconditional results. Verification code is available at the repository linkedbelow.