Comparative Persistence Topologies in Astrophysical Systems: A Structural Analysis of Constraint-Limited Stability Space

This work presents a constrained conceptual comparison of persistence architectures across selected astrophysical systems, including main-sequence stars, white dwarfs, neutron stars, and black holes. The study examines whether structurally heterogeneous systems exhibit comparable narrowing of accessible stability configurations near dominant constraint boundaries. The framework is descriptive and topological rather than predictive or causal. No claim is made that the systems examined share equivalent physical mechanisms, governing equations, or microphysical drivers. The comparison is limited to the geometry of accessible stability space under increasing constraint density. The work does not propose: new physical laws, modifications to General Relativity, or a universal systems framework. Instead, it is presented as a comparative conceptual study in constraint-limited stability topology. This appendix originated as a conceptual stress test of terminology developed in a separate operational infrastructure framework concerning maintenance-dominated regimes in human-built systems. The astrophysical analysis remains operationally and causally distinct from that work.