Task commits credit you from the first turn, under Sinatra's name

Since the end of September the agent has cloned the repository itself, after the point where we installed the trailer hook. So commits from a task's first turn, and from the self-review right after it, went out without your trailer, and only later turns had it. An agent could also pick its own commit identity, and one did: it borrowed the repo owner's email from Cargo.toml, so GitHub credited that commit to them rather than to the Sinatra bot. Sinatra now sets the author and committer for the whole run, which git ranks above git -c user.email=… and any repo config. An explicit --author would still set the author, so the agent is also told not to use one; Sinatra stays the committer either way. Once a hook manager such as Husky sets core.hooksPath, commits still go out without the trailer.