Contribute a change upstream
Use when a Task asks you to prepare a pull request to the original open-source project behind a fork — "Prepare upstream pull request: …" or "Address review on upstream pull request #…". Covers porting exactly one already-merged change onto a clean branch from the project's default branch, following the project's contribution guide and pull request template, running its documented checks, disclosing AI assistance, and stopping when the project requires a signature or does not accept AI-assisted contributions.