Enter and the non-extraction boundary

The Philosophy of Enter distinguishes destructive readout from quantum recovery, a classical record from a decoder, and an analogy from an identification CheungPhilosophy. I-B and En09-A implement a finite destructive instrument returning a classical code and a surviving residual, not the measured quantum clock register CheungIB,CheungEn09. That interface does not select the continuum field, apex extension, vacuum, or wavefront relation.

The background, worldsheet defect, extension, and state remain inputs. A finite conditional density matrix is not the bidistribution analyzed here. A wavefront condition is not an Einstein equation or a derivation of the metric CheungIB (:not-source) CheungXAST (:noeinstein). The philosophical discussion fixes interpretation; it is not a premise of the continuum proof.

of the new result. We prove an exact ordinary $C^{\infty }$-wavefront theorem on $M\times M$, not a theorem about an unspecified boundary wavefront calculus. We do not claim a complete symbol calculus at the geometric–diffractive transition, a classification of all ground states, or an interacting microlocal algebra. The exact wavefront equality does not require any of those stronger claims.