SFM 2.1 and the Planck Boundary: Cognitive-Structural Admissibility, Continuity Traversal, and Descriptive Language Beneath Classical Spacetime

This paper proposes SFM 2.1 as a cognitive-structural admissibility method for approaching the Planck boundary. It does not claim to discover what physically exists beneath the Planck scale or replace quantum gravity. Instead, it treats the Planck boundary as a limit of descriptive admissibility, asking whether ordinary spacetime language remains permitted unchanged and what structural language may still continue.