Electron as a Boundary Condition Particle Structural Origin of Atomic Stability within Existence-Quantized Geometric Theory

The electron is conventionally described as an elementary particle carrying negative electric charge and mediating electromagnetic interaction. While this framework is operationally successful, it leaves unresolved the structural origin of atomic stability and the non-collapse of electrons into the nucleus. This paper presents a structural reinterpretation of the electron within the framework of Existence-Quantized Geometric Theory (EQGT). Rather than acting as a force-mediating particle, the electron is modeled as a boundary condition particle required to regulate spatial torsion associated with nuclear structures. Within this interpretation, atomic stability, orbital discreteness, and the finite range of stable elements emerge as consequences of boundary regulation capacity rather than electric charge balance or force confinement. Atomic number is redefined as a measure of controllable torsion stabilized by available boundary conditions. This role-based framework provides a unified structural explanation for orbital quantization, elemental stability limits, and decay-related role switching phenomena, while preserving the empirical validity of quantum and electromagnetic theories as effective, observer-limited descriptions.