On-device channel-structure reconstructions for QKD attack fingerprinting (IBM Heron ibm_fez, ibm_marrakesh)

Real quantum-hardware reconstructions of single-qubit channel signatures for six attack/noise channel processes in the six-state QKD protocol, measured on two IBM Heron devices (ibm_fez, ibm_marrakesh). Provides the on-device validation data for the manuscript "Attack Fingerprinting in Discrete-Variable Quantum Key Distribution via Tomographic Channel Structure." Includes labeled feature vectors (λ, t), IBM Quantum job identifiers for verification, and reproducibility scripts.