E.18.3:1 - Problem Frame

E.18 already gives FPF a rich language for transformation-flow structure: transfers, dependencies, paths, crossings, guards, valuations, publication faces, comparability, slice-local refresh, and structure-position bindings. A.22.CGUS supplies the broader constraint-governed structure. E.18.3 answers the narrow question: when does that CGUS use one E.18 substrate’s positions, bindings, and obtaining occurrences in its potential continuation topology? Current continuation results and neighboring stronger claims remain separately testable.