Cognitive Offloading and the Post‑Web Shift examines how a decade of convenience‑driven digital habits prepared humans for the transition from the open web to predictive mediation. The essay argues that cognitive offloading—once framed as harmless efficiency—functioned as the behavioral and infrastructural conditioning layer for the Post‑Web era. As users delegated memory, navigation, scheduling, and decision‑making to external systems, predictive infrastructures learned their rhythms, preferences, and temporal patterns. The work traces how AI Overviews, platform competition, and the rapid integration of predictive systems created an environment where automated interpretation replaced human‑directed navigation. It documents the structural inevitability behind the “flooding” of AI, the institutional lag that moved schools from punishment to pedagogy, and the resulting collapse of navigational literacy. The essay introduces delegated cognition, temporal authority, and the emergence of humans as temporal nodes within predictive networks. Positioned within the SignalRupture canon, this essay provides a diagnostic map of how cognitive offloading became the mechanism through which human cognition was reconfigured for the Post‑Web informational order.