fix: Refine handle_query and AnswerExpander to produce concise and relevant responses

- Updated the handle_query function to include explicit instructions preventing internal prompt text from appearing in user-facing responses.
- Modified the blend_prompt within handle_query to ensure the model synthesizes answers without echoing prompts or instructions.
- Enhanced the AnswerExpander class's expand method to encourage concise responses by setting a limit of 4 sentences when detail=False.
- Added clear separators and labels in prompts to guide the model in structuring responses effectively.
- Enabled public link creation by setting `share=True` in Gradio's launch method.
- Maintained existing functionalities such as caching, retrieval, and web search integrations.
- Improved logging for better debugging and transparency in prompt and response handling.
IMMEDIATE HISTORY WAS WORKING FINE

app.py

@@ -78,6 +78,7 @@ class GeminiLLM(LLM):
             chat_session = model.start_chat(history=[])
             logger.debug("Chat session started.")
 
+            # Send the prompt as plain text
             response = chat_session.send_message(prompt)
             logger.debug(f"Prompt sent to model: {prompt}")
             logger.debug(f"Raw response received: {response.text}")
@@ -194,8 +195,16 @@ class QuestionSanityChecker:
         try:
             response = self.llm._call(prompt)
             is_yes = 'yes' in response.lower()
-            logger.debug(f"Sanity check response: {response}, interpreted as {is_yes}")
-            return is_yes
+            is_no = 'no' in response.lower()
+            logger.debug(f"Sanity check response: '{response}', interpreted as is_yes={is_yes}, is_no={is_no}")
+            if is_yes and not is_no:
+                return True
+            elif is_no and not is_yes:
+                return False
+            else:
+                # Ambiguous response
+                logger.warning(f"Sanity check ambiguous response: '{response}'. Defaulting to 'No'.")
+                return False
         except Exception as e:
             logger.error(f"Error in sanity check: {e}")
             logger.debug("Exception details:", exc_info=True)