Background and philosophy

Enter is a destructive readout interface. Its measured quantum names are consumed from the continuation's quantum context; its declared output includes the classical outcome and any unmeasured surviving quantum system. Consumption is an access statement, not annihilation of every physical degree of freedom used by an apparatus.

Cheung's operational characterization concerns a specified strategy class. The journal article and Manuscript I distinguish that characterization from a field instrument or a derivation of qubit kinematics EnterArticle,EnterI. The philosophical account emphasizes that readout, quantum recovery, thermodynamic implementation, and gravitational identification are different constructions EnterPhil.

We use explicit finite Born instruments and prove their channel identities directly. No abbreviated reconstruction of the Enter characterization is a premise of the classical argument.

The spacetime interface follows I-B: a classical conical background, finite quantum names, accessible algebras, locations, schedules, controls, and resources are separately declared IB. The readout does not select or evolve that metric.