QFE-1N: Numerical Null Tests for a Superconducting Quantum-Fluctuation Engine

QFE-1N is the numerical companion to QFE-1, providing reproducible null tests for a superconducting-circuit implementation of the proposed quantum-fluctuation engine framework. The study models a transmon-like two-level system coupled to a truncated resonator battery and an equilibrium thermal reservoir using a detailed-balance Lindblad master equation. The simulations show thermal energy transfer into the resonator without the appearance of anomalous ergotropy or non-equilibrium free energy, consistent with standard quantum thermodynamics. The package includes the numerical model, simulation code, data, figures, reproducibility environment and verification files. No violation of the second law or experimental evidence of single-reservoir work extraction is claimed.