Effect `AsyncLocalStorage` context lost/contaminated inside Effect fibers under concurrent load with RPC
| Symptom | Severity | |———|———-| | auth() returns wrong user's session | Critical — authentication bypass | | cookies() / headers() from Next.js read wrong request | High — data leakage | | OpenTelemetry trace context crosses requests | Medium — incorrect traces | | Works locally, fails in production | Hard to diagnose — only manifests under concurrent load |