## Summary
- Adds a `--upgrade [version]` CLI flag that upgrades the global
CodeNomad CLI server package and exits.
- Uses `bun add --global` for the package upgrade path and includes
server-side tests.
- Rebased onto the latest `dev` because we do not have permission to
push to the original fork branch.
## Credits
- Original PR: #363
- Original author: Pascal André (@pascalandr)
## Testing
- Not run; this PR only recreates the rebased branch from #363.
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Co-authored-by: Pascal André <pascalandr@gmail.com>
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