SFM 2.1 and Black Holes: Descriptive Admissibility, Boundary Inference, and Continuity Handover at Gravitational Limits

This paper applies SFM 2.1 to black holes as gravitational boundary structures. It does not claim to describe the black-hole interior, solve singularities, resolve the information paradox, or replace general relativity or quantum gravity. Instead, it asks what descriptions remain admissible once external measurement, causal access, spacetime continuity, and ordinary object-language begin to fail.