docs: add operations runbook and update test count to 28

README.md

@@ -286,6 +286,62 @@ Actual output columns depend on the current implementation and input dataset.
 - Strengthen checkpoint recovery and API retry behavior.
 - Track ranking changes across releases and review significant shifts.
 - Automate recurring regression reports and release checks.
+## Production Deployment & Operations Runbook
+
+### Dashboard Service (`systemd`)
+
+The multi-platform Streamlit dashboard runs in the background as a Linux systemd service.
+
+**Check service status**
+```bash
+sudo systemctl status hiffi-dashboard --no-pager
+```
+
+**Restart after approved code or dataset updates**
+```bash
+sudo systemctl restart hiffi-dashboard
+```
+
+**View live application logs**
+```bash
+sudo journalctl -u hiffi-dashboard -f
+```
+
+**View the latest 100 log entries**
+```bash
+sudo journalctl -u hiffi-dashboard -n 100 --no-pager
+```
+
+**Enable automatic startup after server reboot**
+```bash
+sudo systemctl enable hiffi-dashboard
+```
+
+### Server Health Checks
+
+Check available disk space:
+```bash
+df -h
+```
+
+Check memory usage:
+```bash
+free -h
+```
+
+List running application sessions:
+```bash
+tmux ls
+```
+
+### Operational Notes
+
+- Confirm the service is active before restarting or stopping it.
+- Check application logs if the dashboard becomes unavailable.
+- Verify dashboard access after any restart or deployment.
+- Back up important files before making production changes.
+- Do not expose API keys, passwords, or other secrets in the repository.
+- Confirm the configured service name and deployment paths before running commands.
 
 ## Summary