- Make smoke-test.sh executable to fix the 'st' alias.
- Restore health-check script from archive to fix the 'hc' alias. The script was moved from `scripts/archived/osvauco-health-check.sh` to `scripts/health-check.sh`.
Per the task in `docs/TODO.md`, this change runs `git update-index --chmod=+x` on all relevant `.sh` and `.py` files in the repository.
This prevents intermittent 'Permission denied' errors when scripts are run in CI/CD environments or after being edited via the GitHub web interface, which can strip file permissions.