Update engine/regimes.py

engine/regimes.py

@@ -0,0 +1,14 @@
+def classify_regime(lam: float, tol: float) -> str:
+    # Near-boundary if |λ| ≤ tol
+    if abs(lam) <= tol:
+        return "Near-boundary"
+    return "Stable" if lam < 0 else "Unstable"
+
+
+def fragility_level(F: float) -> str:
+    # Smaller F => closer to boundary => more fragile
+    if F < 0.05:
+        return "High"
+    if F < 0.15:
+        return "Moderate"
+    return "Low"