CONTRIBUTING: make it clear that AI-generated PRs are not welcome

Includes a pull request template which also warns against this.

For the rationale behind this, please read the text in the CONTRIBUTING guide.

Author: jrfnl

.github/CONTRIBUTING.md

@@ -26,6 +26,26 @@ Ongoing development will be done in the `develop` branch with merges to `main` o
 To contribute an improvement to this project, fork the repo, run `composer install`, make your changes to the code, run the unit tests and code style checks by running `composer check-all`, and if all is good, open a pull request to the `develop` branch.
 Alternatively, if you have push access to this repo, create a feature branch prefixed by `feature/` and then open an intra-repo PR from that branch to `develop`.
 
+### Words of Warning
+
+#### Do Not Violate Copyright
+
+Only submit a PR with your own original code. Do NOT submit a PR containing code which you have largely copied from an externally available sniff, unless you wrote said sniff yourself.
+Open source does not mean that copyright does not apply.
+Copyright infringements will not be tolerated and can lead to you being banned from the repo.
+
+#### Do Not Submit AI Generated PRs
+
+The same goes for (largely) AI-generated PRs. These are not welcome as they will be based on copyrighted code from others without accreditation and without taking the license of the original code into account, let alone getting permission for the use of the code or for re-licensing.
+
+Aside from that, the experience is that AI-generated PRs will be incorrect 100% of the time and cost reviewers too much time.
+Submitting a (largely) AI-generated PR will lead to you being banned from the repo.
+
+### Licensing
+
+By contributing code to this repository, you agree to license your code for use under the
+[MIT license](https://github.com/WordPress/WordPress-Coding-Standards/blob/main/LICENSE).
+
 # Considerations when writing sniffs
 
 ## Public properties

.github/pull_request_template.md

@@ -0,0 +1,33 @@
+<!-- Provide a general summary of your changes in the title above. -->
+
+<!--
+============================================================================================
+Warning: AI generated PRs are NOT welcome and will get you banned from this repo.
+
+Please read the CONTRIBUTING guide before submitting your pull request.
+
+Also please make sure your pull request passes all continuous integration checks.
+PRs which are failing their CI checks will likely be ignored by the maintainers.
+
+Small PRs using atomic, descriptive commits are hugely appreciated as it will make
+reviewing your changes easier for the maintainers.
+
+============================================================================================
+-->
+
+# Description
+<!--
+What do you want to achieve with this PR? Why did you write this code? What problem does this PR solve?
+Describe your changes in detail and, if relevant, explain which choices you have made and why.
+-->
+
+
+## Suggested changelog entry
+<!--
+Please provide a short description of the change for the changelog.
+-->
+
+
+## Related issues/external references
+
+Fixes #