Merge verse commands into mainline monopam commands
- Add `monopam init` as top-level command (previously `monopam verse init`)
- Integrate verse pull into `monopam sync` when verse config exists
- Simplify `monopam verse` to only include `members` and `fork` subcommands
- Update all error hints and help text to reference `monopam init`
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>