ψ-Σ: Summit of Retention — A Unified Architecture Beyond the Observer (White Paper v0.9, EBAF-style)

This white paper introduces ψ-Σ (Summit of Retention) — a unified theoretical and operational framework that reconceives existence as an active process of retentive difference. Moving beyond observer-centred paradigms, ψ-Σ formulates a Lagrangian field theory of retention, where difference (Δψ) and holding nodes (Ξ) are treated as primary ontological variables. Combining formal physics, phenomenological computation, and ethical engineering, the paper presents testable predictions, open-source prototypes (ΞΔ-machines), and a normative Λ-field architecture that integrates ethics into dynamics. ψ-Σ establishes the foundation for a post-observational phenomenophysics, extending inquiry beyond the limits of metric space and observation. The framework is accompanied by reproducible models, an ethics charter, and a roadmap for interdisciplinary verification.