Update logistics_engine.py

logistics_engine.py

@@ -1,10 +1,6 @@
-def logistics_features():
-    # Proxy variables – replace with public indices later
-    congestion_index = 0.65
-    throughput_index = 0.72
-
+def logistics_kernel(econ):
+    friction = 0.08
     return {
-        "port_congestion": congestion_index,
-        "throughput": throughput_index,
-        "logistics_friction": 1.0 - throughput_index
+        "transport_loss": econ["supply"] * friction,
+        "effective_supply": econ["supply"] * (1 - friction)
     }