add csc to demos

tools/replay/fake_csc_demo.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+import time
+import math
+import cereal.messaging as messaging
+
+def main():
+  print("Starting fake CSC demo publisher (Curve Speed Controller)...")
+  
+  # Create a PubMaster for the required services
+  pm = messaging.PubMaster(['starpilotPlan'])
+  
+  # Publish at 20Hz
+  rate = 0.05 
+  
+  while True:
+    now = time.time()
+    
+    # Fake StarPilot Plan
+    sp = messaging.new_message('starpilotPlan')
+    
+    # 8-second cycle stepping through all 4 color spectrums:
+    # 0s - 2s: Green  (Low curvature, t = 0.0)
+    # 2s - 4s: Amber  (Medium curvature, t = 0.38)
+    # 4s - 6s: Orange (High curvature, t = 0.56)
+    # 6s - 8s: Red    (Max curvature, t = 1.0)
+    t = now % 8.0
+    
+    sp.starpilotPlan.cscControllingSpeed = True
+    sp.starpilotPlan.cscTraining = False
+    
+    if t < 2.0:
+      # Green phase
+      sp.starpilotPlan.roadCurvature = 0.0000
+    elif t < 4.0:
+      # Amber/Yellow phase
+      sp.starpilotPlan.roadCurvature = 0.0080
+    elif t < 6.0:
+      # Orange phase
+      sp.starpilotPlan.roadCurvature = 0.0115
+    else:
+      # Red phase
+      sp.starpilotPlan.roadCurvature = 0.0200
+      
+    pm.send('starpilotPlan', sp)
+    
+    time.sleep(rate)
+
+if __name__ == "__main__":
+  main()