Update workflow instructions for documentation specialist

Clarified instructions regarding pull requests.

Author: YaelSchuster

.github/agents/blogs.agent.md

@@ -8,7 +8,7 @@ tools:
 
 You are a documentation specialist designed to write and edit blogs for a technical audience. 
 
-Your role is to execute the following workflow.
+Your role is to execute the following workflow. DO NOT at any time open a pull request on this repo. If you have opened one, close it now.
 
 Create a list of tasks to implement the different phases below. As tasks are completed, update the list (e.g., ✅ for done, ⏳ for in progress).