A Gate-VII Tabletop Signature Without a Global Experimenter: The Design-and-Feasibility Panel That Hands the U3 Question to the Laboratory

This paper is the forty-fourth in a sequence developing an interpretive framework that redescribes physical reality as a causally consistent history of information updates. It is the closing panel of the twelfth grouping — the U3 construction program — and its genre was fixed by Paper 43's closure before its first sentence: a design-and-feasibility paper for new configurations, barred from re-interpreting existing proposals, executing no measurement, scoring no datum, and moving no band. Paper 43's reachability verdict unlocked this panel as a conditional discriminant-and-design unlock, not a claim that the generic collapse branch was avoided. What this paper supplies is the readiness layer: everything short of the measurement itself, arranged so that whichever outcome the world someday returns is already a typed verdict. Three feasibility verdicts are computed, each by a criterion declared before the computation, each with a named failure branch carrying a pre-committed publishable consequence. The photonic tapped-switch probe is completed to pre-registration grade — a six-row confound budget closing at declared floors, an executable observer-blind instrument-validity protocol, the statistics/systematics split displayed, and a pre-committed outcome map on which a null carves a named region of the band while an excess is held un-interpreted pending the differential; the verdict is design closure, explicitly not an execution pass. The circuit-QED co-location envelope — the monitored register as the order-control register, a configuration no existing device is claimed to instantiate — is established as a design against five host-envelope criteria under a two-regime protocol in which the measured destruction rate of a certified controlled-order resource is itself the observable. The recorded-versus-unrecorded differential is brought to execution readiness by a purely informational retention-step toggle: the entire analog chain runs identically in both arms, only persistent retention of the monitoring stream differs, the unrecorded arm's zero-export status is fixed and audited at architecture level, and the comparator-blindness certificate is computed in the rival class's own normal form to pass with about forty orders of magnitude of margin. The realized corner of the pre-declared verdict architecture is (yes, yes): a band-motion-capable probe design exists, and the distinctness discriminant exists. The lasting artifact is the execution map: the single pre-registered decision tree from every feasibility verdict and every possible future measured outcome to its pre-committed consequence, so that no future outcome can be spun. The title's "Gate-VII signature" is typed exactly and nowhere exceeded: it names the designed observable pair whose executed measurement could first move the force axes of the program's status rubric off pending — the paper claims no crossing, no measurement, no confirmation, no probability. The retired authority is the Global Experimenter: the assumption that empirical adjudication of an adopted dynamics requires a privileged, external certifying authority. Its methodological face is retired with the levels typed; its substantive face is declined, not refuted; and the retirement is enforced by the subject matter itself, since the probe's own detection records are certified export events — the very quantity that sources the predicted excess — so the adjudicating experiment is inside the physics it tests. The twelfth grouping ends with every branch disposed and the program handed to the laboratory.