chore(docs): require contributors to disclose their use of AI (#11988)

* note on contributions assisted by AI

* fixes

* nit

Author: zerosnacks

CONTRIBUTING.md

@@ -33,8 +33,31 @@ around bugs and participate in reviewing PRs.
 
 ### Contributions Related to Spelling and Grammar
 
-At this time, we will not be accepting contributions that only fix spelling or grammatical errors in documentation, code or
-elsewhere.
+At this time, we will not be accepting contributions that only fix spelling or grammatical errors in documentation, code or elsewhere.
+
+### Contributions Assisted by AI
+
+If you are using any kind of AI assistance while contributing to Foundry,
+**this must be disclosed in the pull request**, along with the extent to
+which AI assistance was used (e.g. docs only vs. code generation).
+
+If PR responses are being generated by an AI, disclose that as well.
+
+As a small exception, trivial tab-completion doesn't need to be disclosed,
+so long as it is limited to single keywords or short phrases.
+
+An example disclosure:
+
+> This PR was written primarily by Claude Code.
+
+Or a more detailed disclosure:
+
+> I consulted ChatGPT to understand the codebase but the solution
+> was fully authored manually by myself.
+
+Failure to disclose this makes it difficult to determine how much scrutiny to apply to the contribution as it is unclear how much the contributor themselves understands the code they propose to merge.
+
+If you do not disclose your use of AI assistance and reviewers suspect your contribution to be AI generated, it will likely be refused on those grounds.
 
 ### Asking for help