Eve Troubleshooting

It walks through auth loops, secret interpolation errors, deploy job failures, and the newer structured diagnostics from `eve env diagnose` that surface typed failure kinds instead of generic HTTP errors. The sentinel Slack alert section is smart: it reminds you to verify with CLI instead of trusting the ping. Nice touches on the magic-link scanner problem (those mail-security prefetchers that burn OTPs) and the SameSite cookie gotcha for custom domains. If you're running Eve in production, bookmark this. The command patterns are copy-paste ready and the triage flow matches how you'd actually debug in a terminal.