Appendix Axiom 0 — The Multiple-Observer Problem and Shared World Structure in Dualbind

Appendix Axiom 0 takes the Existential Jump Domain fixed in Paper C as its presupposition and treats Axiom 0 as the point of departure for extension. Its central subjects are the formalization of the multiple-observer problem, the S-point parallel structure, the conditions for the obtaining of a shared world, and the structural correspondence of causal reversal. Through these, it structurally fixes the transition from the single Observation Loop of Paper C to the shared world structure. This appendix does not reproduce the main body of Paper C; rather, it fixes the structural boundary of extension and the single connection output to the Paper D series in minimal form. It is published as a paired…