A git sign bug

While working on the new git signing feature for tumpa-cli I noticed that some of the commits can not be verified. For a moment I freaked out and then thought it must be a problem in my code. But, I could not dig enough. Opus 4.7 helped me to find the eaxct commit in git's history and a reproducer. I reported the issue to the maintainers and they are working on a fix. \xc2\xa7 aka § was the cause…