Autonomic Cosmological Mechanism 2.0 (ACM 2.0): A Unified Photon-Dependent Framework for Dynamic Dark Energy and Cyclic Spacetime

This is version 2.0 of the preprint "Autonomic Cosmological Mechanism (ACM 2.0): A Unified Photon-Dependent Framework for Dynamic Dark Energy and Cyclic Spacetime". Major updates compared to version 1.0 (https://doi.org/10.5281/zenodo.18172568):- Introduction of a sigmoid coupling function for smooth and stable transition of dark energy efficacy.- Extended numerical simulations covering the full cosmic cycle, including the Big Squeeze phase.- Quantification of blueshift-induced relativistic mass generation during contraction.- New section on implications for advanced energy harvesting and relativistic propulsion concepts. The model remains fully falsifiable with specific predictions for CMB distortions, BAO scale anomalies in voids, and evolving w(z) in supernova data.