GetCoAuthors gets the current list of co-authors from git config.

GetGitAuthor builds an authors.Author from the current configured user; returns an error if git config is missing user.name or user.email.

ResetMob clears out the co-authors from global git config.

SetGitAuthor sets the primary git author locally from the given authors.Author.

SetGitAuthorGlobal sets the primary git author globally from the given authors.Author.