MPC v6.82.190 staging launch checklist

[ ] Existing cPanel .htaccess was preserved
[ ] Existing CloudLinux node_modules symlink was preserved
[ ] /home/marljsei/mpc-runtime-staging was preserved
[ ] Node.js App uses Node 20.20.2
[ ] Application mode is Production
[ ] Application root is staging.marlothparkcentral.com
[ ] Startup file is server.js
[ ] APP_ENV=staging
[ ] SITE_URL=https://staging.marlothparkcentral.com
[ ] NEXT_PUBLIC_SITE_URL=https://staging.marlothparkcentral.com
[ ] MPC_RUNTIME_ROOT=/home/marljsei/mpc-runtime-staging
[ ] Strong staging-only MPC_ADMIN_PASSWORD is configured
[ ] bash scripts/deploy-cpanel-staging.sh completed successfully
[ ] /healthz returns 200
[ ] /readyz returns 200
[ ] /api/build-info reports staging and 6.82.190
[ ] robots.txt disallows all staging crawling
[ ] X-Robots-Tag is noindex on staging responses
[ ] bash scripts/verify-live-staging.sh completed successfully