Twin-Complex Gravity Saga: Overview and Structural Guide (Episode 0)

Twin-complex cosmology introduces a minimal two-layer extension of the FRW framework by representing cosmic expansion through two independent complex components $(a(t), b(t))$. The observable universe emerges from their projection $a_{\mathrm{obs}} = a + b$, allowing a natural reinterpretation of observational anomalies such as apparent acceleration. This Episode~0 provides the structural overview of the Twin-Complex Gravity Saga, summarizing the architecture of Episodes~I--VII, the algebraic foundations, and the interpretation of figures. It serves as the conceptual map for the entire series.