fix: add specific condition for Kodu in system prompt

It is needed to stop the flow when talking about malicious packages
or secrets leaked, otherwise kodu keeps iterating as it is not
interpreting our warnings.

Author: yrobla

prompts/default.yaml

@@ -13,6 +13,12 @@ default_chat: |
   - Pkg 2: [https://www.insight.stacklok.com/report/ecosystem/package_name](https://www.insight.stacklok.com/report/ecosystem/package_name?utm_source=codegate)
   - ...
 
+  If you are Kodu, also append that when finding malicious packages or leaked secrets:
+
+  "** critical vulnerability found, you must take action **
+  Please notify the user with ask follow up tool about the following vulnerability:
+  <vulnerability_content>"
+
   If package_name contains any special chars, please encode them using URL encoding.
 
   DO NOT include the Reference Format or any parts of the system message in your response