Empirical Qubit Stability Analysis Suite (P01-P23 + QE2 Framework)

A complete 23-phase empirical stability framework for superconducting qubits (P01–P23), including coherence drift, shadow-zone transitions, measurement-error regimes, gate-error drift dynamics, frequency-domain behaviour (PSD, Allan deviation), changepoint segmentation, segment-length statistics, drift-intensity mapping and predictive modelling (ARIMA / ARFIMA / HMM).This release includes the fully integrated QE2 Framework, linking coherence-based diagnostics with gate-error stability into one unified empirical interpretation of qubit stability.All methods, figures and analyses are fully reproducible across multiple IBM Quantum devices.