We present a unified, field-based explanation for the formation, alignment, and expansion behavior of cosmic filaments and voids. Building upon the Resonance-Suppression (RS) framework, we propose that large-scale cosmic structure emerges from coherent harmonic scaffolding modulated by suppression fields—quantum-scale filters that regulate energy distribution, wave reinforcement, and space time connectivity. Unlike standard ΛCDM models, which depend on dark matter particles and inflationary perturbation seeds, the RS model derives filament and void geometry directly from wave interference principles, requiring no exotic matter. This approach provides a falsifiable alternative that predicts quantized filament spacing, void boundary coherence, and harmonic clustering, with strong alignment to observational datasets. Through a combination of field derivations and observational tests, we show that filament thickness, void asymmetry, and AGN clustering patterns all emerge naturally from resonance envelopes without fine-tuning. Filaments represent stabilized resonance nodes, while voids arise from off-resonance suppression basins. Our model outperforms classical alternatives in both predictive power and falsifiability, and aligns closely with recent filament alignment studies, CMB-lensing cross-correlations, and gravitational wave echo predictions. This paper follows a structured approach: we first derive the RS field’s gravitational role, define its mathematical formalism, and then validate it across key cosmological observables. Finally, we offer a falsifiable predictions list and a full parameter formulation for future testing. Our findings suggest that the cosmic web may be less a chaotic byproduct and more a harmonic expression of a deeply ordered spacetime field.