Cross-Model Persona Portability — Three Vindications in May 2026
May 2026 produced three independent signals that all point in the same architectural direction. Read separately, each is a strong observation about how AI agent systems are evolving. Read together, they describe a single bet: persona is infrastructure that lives outside any individual model. Soul Spec made that bet 12 weeks ago. This post walks through what changed, why these signals matter, and why the architectural decision now has measurable economic value rather than theoretical value alone. ...