Paper VII develops the variational and functional calculus chapter of the Realm Calculus framework. It establishes realm aware action principles, realm Euler Lagrange equations with anomaly residue, realm Hamiltonian formulation with asymmetric Legendre transform, realm Noether theorem with a two trace conservation law, realm Hamilton Jacobi equation, and realm canonical transformations. The technical centerpiece is the Schwarzian cocycle interpretation of the rank four Stasheff associator, shown to unify across four structural faces: the conformal Weyl anomaly, BRST nilpotency, Atiyah Singer index correction, and the variational Ward identity, all carrying the same universal central charge coefficient. The paper then derives the Born rule as the strict trace coherence quotient of the KMS state via zeta projection, and develops Kneser weighted spectral amplitudes for the realm geometric Laplacian. It closes several Paper V deferrals (BV master equation as an L infinity master equation, realm canonical transformations with generating functions, realm Hamilton Jacobi) and provides stubs for Paper VIII on realm Gleason theorem and the realm path integral measure. Level two limits recover classical Lagrangian Hamiltonian mechanics and field theory throughout.