Resolving the Pioneer Anomaly: A Direct Measurement of Lattice Structural Resistance L lim

This research provides a deterministic resolution to the Pioneer Anomaly—the unexplained, constant sunward deceleration of the Pioneer 10 and 11 spacecraft ($a_p \approx 8.74 \times 10^{-10} \text{ m/s}^2$). While mainstream consensus attributes this phenomenon to anisotropic thermal radiation (thermal recoil), this paper demonstrates that such a model lacks ontological closure and fails to account for the extreme long-term stability of the signal. Utilizing the framework of Invariant Structural Electrodynamics (ISE), specifically the Law of Finite Structural Capacity (Law II), the author identifies the deceleration as the first direct empirical measurement of the "Structural Drag" inherent in the contiguous field-lattice. Within the $\Sigma=0$ Protocol, a mass moving through the vacuum is not traveling through a void, but is an active disturbance ($\Phi_A$) interacting with a resistive structural medium. The observed value of $a_p$ is derived as the Structural Resistance Constant of the baseline lattice. This resolution transforms a supposed "hardware error" into a fundamental physical signature of the universe's architecture. This work serves as the second empirical validation of the ISE axioms, following the resolution of the Chandler Wobble discrepancy. Conceptual Bridge: This article is part of a unified series. Readers are encouraged to consult the foundational axioms in ISE Part I.A (Axioms of Invariant Structural Electrodynamics) and the overarching monograph "The Code of Creation" (DOI: 10.5281/zenodo.18068172) for the complete theoretical context.