Phoenix EMS K/N Diagnostic: Data and Analytical Artifacts (v1.1)

Derived data and analytical artifacts supporting the manuscript "Decision-to-prediction ratio K/N as an instance-level diagnostic for SPO+ versus 2S-MSE on Phoenix EMS station siting". Includes OSRM travel-time matrix (56 stations × 359 tracts), CDC SVI 2022 tract-level percentiles, optimal station expansion MILP outputs, alternative-optima enumeration (cardinality-5, ≥500 solutions), K/N regression results, and all numerical contents of Tables 1-9.