Proton-Trapped Electron as the Generator of Spin-2 Gravitational Radiation: Coulomb Confinement, ZB Axis Locking, and the Separation of Gravitational and Electromagnetic Sectors

[59 Structural — Bound-State Condition for Directed Emission] This paper addresses a question left open by Paper #52 (2026): what determines the direction of the ejected spin-2 photon-sphere fragment, and why does its emission not average to zero over many Zitterbewegung cycles? The decisive structural observation is that a free electron's ZB axis precesses deterministically by \(\Delta\phi = 2\pi a_e\) per cycle without an external preferred direction, isotropizing the emission over a precessio