K.I.S.S. Theory: A Bounded Variational Framework for Quantum Mechanics, Gravitation, and Cosmology

K.I.S.S. Theory, a finite variational framework in which physical reality is described by sixteen coupled dimensional vector waves arranged in eight polarity pairs. All dynamics arise from constrained extremisation of a bounded action, with Dimensional Tension Limits (DTL) enforcing finite curvature and eliminating singularities. Quantum mechanics, gravitation, and cosmology emerge as limiting regimes of the same underlying structure. Wavefunction collapse is derived as deterministic saturation under finite observational bandwidth. The Born rule arises geometrically from bounded phase space. Gravitational horizons emerge as saturation surfaces rather than singularities, resolving information-loss paradoxes without exotic assumptions. At cosmological scales, the finite manifold structure naturally explains low-multipole suppression in the cosmic microwave background without invoking inflation or dark energy. At high energies, apparent violations of four-dimensional energy conservation are reinterpreted as dimensional bleed, providing an alternative explanation for missing transverse energy observed in collider experiments. The framework is explicitly falsifiable: observation of true physical singularities, infinite curvature, absolute invariance of constants under extreme conditions, or irreversible information loss would invalidate the theory. The work is presented as a foundational preprint, with empirical alignment demonstrated through worked examples and toy models.