prompt: fix gen ai tag escaping

inference_api.py

@@ -655,7 +655,7 @@ def trigger_gemini_explanation(skills: List[str], preference: str, question: Opt
         f"using their hobby (\"{preference}\") as a creative analogy, theme, or context to make it highly engaging and easy to understand. "
         "If the question requires step-by-step mathematical problem solving, show the clear step-by-step calculations. "
         "Keep the overall response extremely concise and strictly under 10 lines total. "
-        "Format the output strictly using HTML tags (e.g., <em> for italics, <b> for bold, <br> for newlines) instead of Markdown."
+        "CRITICAL FORMATTING RULE: Format the output strictly using RAW HTML tags (e.g., <em>, <b>, <br>) instead of Markdown. DO NOT escape the tags into HTML entities (e.g., never use &lt; or &gt;). You must output the literal < and > characters for your tags."
     )
     
     logger.info(f"[Gemini Prompt]\n{prompt}")