From Vacuum Porosity to Spacetime and Cosmic Expansion - A Unified Relational Framework for Asymptotic Stabilisation and Dynamical Dark Energy

What if vacuum porosity, cosmic expansion, the stabilisation of physical constants and the emergence of spacetime were different expressions of the same physical process? This note presents a unified theoretical framework organised around four connected ideas: intrinsic vacuum porosity, asymptotic stabilisation, expansive redistribution, and the contextual emergence of propagation, space and time. Vacuum porosity is treated as a structural non-saturation that preserves relational accessibility, physical transfer and response. Within this picture, quantities such as the effective propagation limit, the effective quantum scale and the residual vacuum tension are interpreted as evolving towards stable asymptotic values through the response of the system itself. At cosmological scales, residual vacuum tension becomes dynamically relevant and is directly connected, through covariant conservation, to the effective dark-energy equation of state. The resulting late-time behaviour is compatible with the sector currently favoured, with dataset-dependent significance, by combinations of DESI DR2 measurements with CMB and Type Ia supernova observations. The framework remains compatible, in its mature regime, with relativistic causal structure and Einsteinian gravitational dynamics. At a deeper genealogical level, it explores how relation, transferability, separation and ordering can provide the structural conditions from which metric space, temporal order and stable propagation emerge contextually. The note is intentionally conceptual and synthetic. Detailed derivations, logical consistency checks, mathematical countertests, internal coherence analyses, observational comparisons and explicit falsifiability criteria are developed in the related technical notes. Its central proposal can be summarised as a single structural sequence: non-saturation → relational accessibility → redistribution → structuring → stabilisation