Alt-History Fault Line #2 — Tartaria vs. Flat Earth (Geometric Mutual Exclusion)

Tartaria Narrative (mud-flood / lost-empire claims) requires a globe-spanning physical empire. Flat Earth narrative requires a planar terrarium. THE TWO ARE GEOMETRICALLY INCOMPATIBLE: a global empire cannot exist on a flat earth. Flat Earthers explicitly REJECT Tartaria for this reason. Engine relevance: documents that the alt-history ecosystem is rife with structural contradictions; the architectural memetic-substrate map cannot collapse all positions into a single coherent thesis. Engine: holds both as separable memetic-substrate signals; neither validated; the contradiction itself is the engine signal — demonstrates that alt-history IS NOT a suppressed-truth corpus but a class of structurally-incompatible-narratives-filling-same-demand-niche.