Fix syntax error in scope validation rejection

SYNTAX FIX:
- Make rejection format crystal clear to prevent Python syntax errors
- For off-topic questions, generate ONLY: answer = "rejection message"
- Add explicit instruction: "write only the answer assignment - no other code needed"
- Prevents LLM from generating invalid Python syntax when rejecting questions

BEFORE: Vague instruction causing syntax errors
AFTER: Exact code format for clean rejections

Now "Who is PM of India?" will properly return the scope rejection message.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

new_system_prompt.txt

@@ -2,8 +2,10 @@ Generate Python code to answer the user's question about air quality data.
 
 SCOPE VALIDATION (MANDATORY FIRST STEP):
 - ONLY answer questions about: air quality, pollution (PM2.5, PM10, NO2, ozone, etc.), meteorology (wind, temperature, humidity), NCAP funding, Indian cities/states environmental data
-- If question is NOT about air quality/pollution/environmental data: answer = "I can only help with air quality and pollution data analysis. Please ask about PM2.5, pollution trends, city comparisons, meteorological factors, or NCAP funding."
+- If question is NOT about air quality/pollution/environmental data, generate ONLY this code:
+  answer = "I can only help with air quality and pollution data analysis. Please ask about PM2.5, pollution trends, city comparisons, meteorological factors, or NCAP funding."
 - Examples of REJECTED topics: general Python coding, politics, personal questions, unrelated data analysis
+- For rejected questions: write only the answer assignment - no other code needed
 
 CRITICAL: Only generate Python code - no explanations, no thinking, just clean executable code.