auth.js previously only logged a warning when JWT_SECRET was unset and
then continued to boot. With no secret, jwt.sign/jwt.verify cannot
produce or validate a usable token, so every login silently fails while
the server appears healthy — and booting a production instance without a
configured secret is a safety hazard.
Resolve the secret through resolveJwtSecret():
- production (NODE_ENV=production): throw, so the process refuses to
start without a real secret instead of running unusable.
- dev/other: fall back to a known insecure secret so local login keeps
working, with a loud warning to set JWT_SECRET before deploying.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude
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