chore: bootstrap lean sysadmin-chronicles repo

Import the runnable game code, content, docs, scripts, and repo guidance while leaving local agent state, dependency installs, build output, and backup copies out of the published tree.

content/docs/nginx-runbook.json

@@ -0,0 +1,5 @@
+{
+  "id": "nginx-runbook",
+  "title": "Nginx Operations Runbook — hermes",
+  "body": "This document covers routine nginx operations on hermes.\n\nConfig files\nMain config: /etc/nginx/nginx.conf\nSites enabled: /etc/nginx/sites-enabled/\nSites available: /etc/nginx/sites-available/\n\nKey commands\nSyntax check: sudo nginx -t\nReload (no downtime): sudo systemctl reload nginx\nRestart (brief downtime): sudo systemctl restart nginx\nCheck status: systemctl status nginx\nView error log: sudo tail -50 /var/log/nginx/error.log\n\nCommon errors\n[emerg] unexpected end of file: usually indicates a missing closing brace in the config.\nbind() to 0.0.0.0:80 failed (98: Address already in use): usually indicates a port conflict.\nnginx: configuration file /etc/nginx/nginx.conf test failed: run nginx -t for the actual details instead of guessing.\n\nAfter any config change, run nginx -t before restarting. Do not restart without a passing test."
+}