Contribution doc: explicit expectation for what to PR or not

Author: mcmonkey4eva

CONTRIBUTING.md

@@ -23,6 +23,8 @@ When writing a pull request, you are expected:
     - ie, you must actually understand your own work. If an LLM wrote it for you and you don't understand it, do not try to PR it.
 - To have tested your own work prior to submitting.
 
+Pull Requests from newer contributors that are not directly addressing an issue with the `Easy PR` label may be closed without warning or reason. Frequent contributors may take issues that do not have that label. Only trusted maintainers should make code changes not related to a listed issue.
+
 ## C#
 
 Contributing to the C# server code, or writing an extension? I recommend Visual Studio 2022 as the optimal IDE for this. Follow standard C# formatting rules. Look at existing code if in doubt. We use a modern C# Syntax.