Previously middleware.ts listed /api/ as a public prefix, so any new
API route added under /api/** was served without a session check
unless the developer remembered to self-authenticate it. The
middleware now returns 404 for any /api path not explicitly
allowlisted (auth, trpc, sse, cron, reports, health, ready, perf) —
adding a new API route is a deliberate allowlist edit. verifyCronSecret
was already fail-closed when CRON_SECRET is unset; added unit tests.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>