BELLWETHER-3: Peres-Mermin State-Independent Contextuality Witness Bound into an Authorization Nonce

Preregistered Peres-Mermin magic-square witness (state-independent quantum contextuality) executed on IBM Quantum hardware (ibm_fez), measured chi=5.27-5.38 across three input states (|00>, |++>, Bell); noncontextual bound 4, quantum value 6; all 3-sigma; bound into an authorization nonce / ProofRecord. Device-dependent; compatibility (non-disturbance) and detection loopholes OPEN; state-independence DEMONSTRATED across tested states, not proven for all states; NOT loophole-free; NOT device-independent certified randomness. Part of the BELLWETHER series, Remnant Fieldworks Inc. (ExecutionProof Research Program).