C.19.2:4.6 - Optional demonstration, not an admitted structure

A short branch presentation may show one-apparatus, candidate-generation, choose, probe/reject, application, result, and reopen continuations as a ProvisionalUnfoldingDemonstrationDescription@Context. It is an episteme for teaching. The presentation alone establishes no admitted U.Structure, CGUS, work plan, work occurrence, or problem-facing result; CGUS admission requires every A.22.CGUS coordinate independently.