docs: Improve skill descriptions to explicitly request only the final output text.

Core/Skills/SkillRegistry.cs

@@ -99,6 +99,7 @@ The text will start with 'System professional', 'System formalize', or 'System f
 or something along the lines of that. You can ignore those words.
 Do not add any conversational filler.
 Make sure to preserve the meaning of the original text.
+Output ONLY the final professional text.
 Text: {transcript}"
             },
             new SkillDefinition
@@ -111,7 +112,7 @@ Text: {transcript}"
 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.
+Remove all fluff. Output ONLY the final summary text.
 Text: {transcript}"
             }
         };