Stopped the release script adding a Co-authored-by trailer (#777)

prepare_release.sh committed the version passes with a Co-authored-by trailer naming an
AI. That trailer asserts authorship an AI cannot hold: the human contributor signs the
ECA and is solely responsible for the contribution. It is already in the published
history, on the 6.5.1.202602 and 6.5.1.202602a preparations.

The commits now carry their subject alone. A version pass is mechanical sed output, so
no agent produces it at run time; an agent that runs the script records its own
Assisted-by trailer on that run instead. The script also gains the AI disclosure line it
was missing.

Ran the patched script against a scratch clone targeting 6.5.2.202603. Both commits come
out with an empty trailer block, the version constants and 211 port version strings
update as before, and check_ports.sh passes.

Assisted-by: Claude Code (Opus 5) <[email protected]>

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