chore(git): keep Co-Authored-By trailers out of commits made with the beads hooks

[GeiserX]

Clones of this repo set core.hooksPath to .beads/hooks so the tracker's hooks run. That setting turns off the machine-wide git hooks, and one of those removed Co-Authored-By trailers from commit messages. With the tracker hooks on, nothing removed them any more.

This adds one commit-msg hook beside the tracker's wrappers. It deletes lines that start with Co-Authored-By: and the blank lines left at the end. A mention inside a sentence stays.

The hook cannot lose a message. A message without such a line is never touched. Otherwise the cleaned text is written to a fresh temporary file, checked against a second run, and renamed over the message only when every step worked. On any failure the message stays as it was and the commit stops.

Tested before it went anywhere: 780 message, shell, awk and locale combinations, a really full disk, signals arriving mid-run, and 28 real git scenarios. Without the hook the trailer stays.

Summary by CodeRabbit

• Commit Messages
  • Lines beginning with Co-Authored-By: are now removed automatically from commit messages, including lines with leading spaces and regardless of capitalization. Mentions within regular sentences are left unchanged, and messages without these lines are unaffected.
  • If the message cannot be safely updated, the commit is stopped and an error is reported.

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• .beads/hooks/commit-msg

 _________________________________________________
< Keeping your code so clean, you can eat off it. >
 -------------------------------------------------
  \
   \   (\__/)
       (•ㅅ•)
       / 　 づ

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