Paper X — Horizons, Saturation, and Constraints on Quantum Gravity DescriptionConcluding the foundational phase of the Ordered-Dynamics Reconstruction Program, this paper analyzes horizons and saturation phenomena arising from finite information flow. Black-hole-like and cosmological horizons emerge as operational limits rather than geometric singularities. The results impose strong constraints on admissible quantum gravity theories and establish saturation as a universal operational principle. Keywordsquantum gravity; horizons; information saturation; black holes; cosmology; foundational physics