Recognition Structure from Responses and Records

Which physical structure must a description preserve if it preserves what participants can achieve? Calibrated responses reconstruct a directed recognition ledger, and answerable interruptions require retained records. For a finite quantum carrier, preserving a finite family of perfectly solvable decisions forces a completely positive recovery of its entire state, including reference correlations. Two binary decisions suffice for a qubit. Recovery transports every instrument on the carrier, including adaptive protocols. An exact closure criterion identifies when additional physical operations require a richer description. These results connect participant consequences to operational structure without assuming that adequacy means possession of an RS representation. Native constructions then separate normal photon states and, under specified apparatus and control assumptions, approximate normal field channels. The resulting necessity and realization theorems identify concrete obligations for universal physical completeness: selecting the physical carriers, interactions, apparatus and occurrence law. Files. The 59-page paper is accompanied by its complete LaTeX source, reproduction instructions, release manifest, change log and license notice.