Interface-Dependent Optical Accessibility in Dark Exciton Architectures: A Minimal Reproducible Stress Test

This technical note presents a minimal reproducible synthetic stress test showing that optical accessibility can depend strongly on interface family even when the latent excitonic support is held fixed. The note does not propose new exciton physics, a new microscopic theory of dark-state formation, or a reinterpretation of specific experiments. Instead, it introduces a controlled benchmark in which bright and dark excitonic branches are observed under three interface families—a standard far-field interface, a guided selective interface, and a brightening-enhanced interface—and evaluates the resulting separation between direct manifestation, stabilization, and borrowed quantification. The accompanying code reproduces the synthetic systems, strict summary metrics, and main figures. The main result is methodological: weak direct visibility under one interface should not be treated as equivalent to absence of latent support, and successful quantitative recovery need not imply strong direct manifestation.