UCT No-New-Constants Prediction 2: Five-Level Quantum Readout Floor (Pre-Registration, Stage 1)

Stage 1 pre-registration of a no-new-constants forward prediction derived from the UCT compression-interface theorem at d = 5. Predicts the structured readout floor f_U(5) = 24/25 = 0.9600 for U(5)-covariant readout, with primary discriminator f_{Z_2^5} = 31/32 = 0.96875 for sign-channel readout. Contains: theoretical input, prediction and discriminator, five-criterion architecture classifier, mundane-source noise budget with pre-test gate, statistical-power requirement, Bayes-factor decision rule, falsification criterion, and Stage 2 commitments. No retroactive parameter tuning, target relabelling, or architecture reclassification is permitted under this lock. SHA-256 of pre-registration file: a4526c9e03904fba70c18fd291b03e10d9f338cae591ddaaabf5339ebf0ac0eeByte count: 12664Stage: 1 of 2 (protocol and prediction lock, platform-agnostic)