help messages don't have trailing newlines

Description

Here is an example:

vagrant@vagrant:~$ opencode agent --help
opencode agent

manage agents

Commands:
  opencode agent create  create a new agent
  opencode agent list    list all available agents

Options:
  -h, --help        show help                                                              [boolean]
  -v, --version     show version number                                                    [boolean]
      --print-logs  print logs to stderr                                                   [boolean]
      --log-level   log level                   [string] [choices: "DEBUG", "INFO", "WARN", "ERROR"]
      --pure        run without external plugins                                           [boolean]vagrant@vagrant:~$

Plugins

No response

OpenCode version

1.18.30

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response