This paper presents the Functional Stability Theory (FST) axiom package for the spectrum-zero identification underlying the Riemann Hypothesis (RH), together with a conditional endgame for Route B (CCM-prolate) that closes all previously open spectral estimates. The Three-Lemma Endgame conditionally resolves the CCM missing step (MS2) via mass-based spectral cluster analysis: three independent lemmas (Scalar Secular Cancellation, Projected Poisson Quasimode, Coercive Complement) combine via a standard quasimode-to-projector inequality to yield mass concentration as a corollary. The condition is a Galerkin-faithfulness hypothesis, numerically verified to 12 digits of precision for lambda = 3,...,100. GitHub: research-line/functional-stability-theory
Lukas Geiger (Mon,) studied this question.