Add `laconic-so deployment restart` command that:
- Pulls latest code from stack git repository
- Regenerates spec.yml from stack's commands.py
- Verifies DNS if hostname changed (with --force to skip)
- Syncs deployment directory preserving cluster ID and data
- Stops and restarts deployment with --skip-cluster-management
Also stores stack-source path in deployment.yml during create
for automatic stack location on restart.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
