Observing Case: Does the Galactic Acceleration Scale Evolve? One Deep-MOND Rotator at z ~ 2.5 Decides

Companion to the pre-registered measurement (doi:10.5281/zenodo.22563139), written for observers. Two readings of the radial-acceleration scale a0 predict opposite redshift behaviour: tied to the dark-energy density it is constant; as the emergent scale of ΛCDM haloes it tracks H(z) and rises by 1.20 in rotation speed at fixed baryonic mass by z ≈ 2.5. Frozen statistic: deep-MOND Tully-Fisher zero-point shift, 0.00 dex (constant) vs +0.33 dex (rising), decidable at ±0.13 dex with one galaxy that is deep-MOND, rotation-dominated, gas-measured and lens-controlled. Contents: the five-condition target gate; the NIRSpec G235H then ALMA Band 3 CO(3-2) funnel; the per-galaxy error budget; the candidate ledger (no known object passes the gate today: the decisive galaxy must be found from low-mass highly magnified lensed discs, first targets Abell 68 C4 and C20b); mandatory controls; an order-of-magnitude time request; the frozen decision rule. Either outcome is a publishable, pre-registered result. AI-assisted research programme; not peer reviewed.