Nothing stop to us to introduce something like `Co-authored-by:` but for AI, like `AI-Assisted-by: <harness/model>` / `AI-Paired-by: <harness/model>` / `AI-Copiloted-by: <harness/model>` / `AI-Automated-by: <harness/model>`.
I recall the Linux kernel uses "Assisted-by" lines or something like that, which sounds about right.