This theoretical work presents a causal-geometric framework providing a structural unification of quantum mechanics, general relativity, and the cosmological dark sector. Rooted in a single ontological postulate—the existence of an external causal space Z_0 from which discrete impulses (khrons) are projected into observable spacetime—the framework unfolds from a unique, fundamental dimensionless parameter: β = ℓ_P / L_Λ ≈ 10^−61. Notably, no phenomenological parameters are fitted to observations. The framework derives, from first principles, a multi-domain manifold structure that accounts for: * Galactic dynamics: Rotation curves explained without particulate dark matter. ** Cosmology: Acceleration without fine-tuning of Λ, and the unexpected efficiency of early galaxy formation revealed by the JWST (a structural prediction matching the observed number density at z ≈ 16). *** Particle Physics: The Galactic gamma-ray excess at ~ 20 GeV, kaon CP violation, and several other empirical anomalies of the Standard Model. The paper serves as the cornerstone of a corpus developed independently. It assumes the methodological position of an outsider working without institutional affiliation, following the philosophical lineage of Louis de Broglie, Robert Lévi, Laurent Nottale, Jean-Pierre Petit, and the structural mathematical tradition of Bourbaki, Grothendieck, and Béziau. ( direct link )