[next app router] Clerk cant detect authMiddleware when used in Layout
## Context
Clerk cannot detect authMiddleware when it is referenced from a layout; the app throws 'Clerk: Unable to verify request, this usually means the Clerk middleware did not run.' Works in dev, breaks after build/deploy to production.
## Verified resolution
Contributor jescalan: this error is shown on purpose when the middleware is misconfigured or not present for the route - it is not something a library patch can fix. Fix: ensure Clerk's middleware is properly integrated and its matcher covers the route (deployment host/proxy config matters); share a full reproduction with the support team if it persists.