next-instant-blocking-repro

Reframe: instant() lets a blocked navigation complete in dev; trigger is await params (known param) outside <Suspense> in a fallback render; dev-only

Clean root layout comment; list app/layout.js in README

Generalize to any generateStaticParams-covered param; add prod test (leak is dev-only)

README: describe the bug only (root param deferred in fallback render); drop the workaround

Simplify repro: root-param await outside <Suspense> + fallback route leaks under instant() (next 16.3.0-canary.39)