Replace the guidance to credit LLM usage via 'Co-authored-by:' with the
Linux kernel convention. Co-Authored-By and Co-Developed-By are reserved
for human authors (who must also sign off); AI/LLM assistance is
disclosed with an Assisted-By: trailer instead.
Apply the new policy to this commit as a worked example.
Assisted-By: Claude Code (claude-opus-4)
Claude-Session: https://claude.ai/code/session_01NFpGtGTWUEYXLwZeZs2RAV
Signed-off-by: Stan Grams <sjg@haxx.space>