Fix CLI help: remove tangled auth login, fix nonexistent push command
- Remove all references to 'tangled auth login' (no longer needed)
- Replace 'monopam push' references with 'monopam sync' workflow
- Update verse quick start to remove authentication step
- Replace AUTHENTICATION sections with HANDLES/HANDLE VALIDATION
- Document --skip-push and --skip-pull for finer control
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>