Standard Model Particles as Closed Walks on K_7, II: Cross-Vendor and Cross-Architecture Stabilizer-Syndrome Reproduction on Quantum Hardware

Experimental companion (Paper 21b) of the NWT program. The substrate-canonical Steane [[7,1,3]] preparation circuits are executed on real quantum hardware (IBM Heron r2, IQM Garnet, AQT Ibex-Q1), reproducing the predicted stabilizer-syndrome structure cross-vendor and cross-architecture, including the cross-sector syndrome equivalences. Honest scope: the experiments establish that the predicted syndrome structure is preparable, mutually distinguishable, and architecture-independent on real hardware (realizability), not framework validation. Companion to Paper 21a (theory) and Paper 22 (cosmogenesis).