[SUPERSEDED] Cascade Cosmology from the String Landscape

Superseded. The two-phase vacuum-evolution cascade rests on a modified-gravity activation excluded by equivalence-principle and wide-binary constraints. The surviving expansion-history feature is carried by Zenodo 10.5281/zenodo.21456863; the string-landscape construction survives only as a motivation-neutral candidate in the author's UV-completion paper. See the attached supersession notice. Retained for transparency.