Clarify summarization skill system prompt by rephrasing ignore instruction and removing redundant 'Remove all fluff'.

Core/Skills/SkillRegistry.cs

@@ -111,8 +111,8 @@ Text: {transcript}"
                 SystemPrompt = @"Summarize the following text to be as concise
 and direct as possible.
 The text will start with 'System summary', 'System concise', or 'System summarize',
-and you can ignore those words.
-Remove all fluff. Output ONLY the final summary text.
+and you shoul ignore that part of the text.
+Output ONLY the final summary text.
 Text: {transcript}"
             }
         };