Update app.py

app.py

@@ -99,11 +99,12 @@ Steps:
  3) Give a concise recommendation with time window(s) and a confidence.
  4) Output a short WHY-TRACE (3 bullets).
 Return JSON ONLY:
-{
+{{
  "answer": "...",
  "why_trace": ["...", "...", "..."],
  "risk_badge": "Low"|"Moderate"|"High"
-}"""
+}}
+"""
 
 # -------- Reasoning providers --------
 def call_stub(_prompt:str)->str: