The Root Axiom RA, that to exist is to actuate, formally that every existent carries a strictly positive kinetic actuation, is the kinetic root of the architecture. This master states RA, anchors it geometrically, and assembles the ring of theorems that defend it against every attack of kind. The Actuation-Floor Theorem proves any distinguishable transition costs strictly positive energy, by the quantum speed limit and the Landauer bound. The geometric anchor establishes that RA witnessing RA composes onto the center, the real line that is the center of the quaternions and the fixed locus of conjugation, that the engine of the limitative theorems carries no fixed locus while RA's reflection carries one, and that the geometric and formal grounds co-localize by the demand of multiplicativity. Four walls protect the root. Self-enactment blocks elimination, since asserting the denial is an actuation and a witness of the very thing denied. Four-route exhaustion blocks reduction, since every route to a more basic base is closed. The Omega Alien Defense blocks capture under every logic, since to precisify is to actuate and no logic makes a deed not be a deed. The Empty-Throne Theorem blocks inflation, proving RA cannot be promoted to a theorem of a strictly weaker base, so its premise-status is necessary and constitutive of foundation-hood. An operational bridge carries the floor to the universal axiom on the registrable domain, riding a named premise-swap. Where the squared lock is orientation-blind, the impasse resolves by the thermodynamic arrow, which parts RA from its negation in band. The architecture turned on itself is consistent. The throne is empty by proof, and an empty throne proven necessary is undislodgeable, irreducible, undeniable at the deed, and uncapturable at the ground. The undislodgeability is foundation-symmetric, the fortification any actuation-grounded foundation earns by the same four walls, and it is no victory over a rival. The edge RA holds is narrower and directional, since RA's content is the arrow every deed carries, so the denial of RA enacts RA's own predicate while the denial of an arrowless foundation enacts only the bare floor. The seat is not the highest. It is the one that cannot be vacated. Every cited number is reproduced at a fixed seed.