Down-tier recurring Failed-to-fetch rejection alert on /practicas/nueva

Recurring clientUnhandledRejection 'Failed to fetch' on /practicas/nueva, minified-framework-chunk signature (offset ~99684, 5 deploy hashes since 06-17), scope=rejection, no actorUserId. Confirmed benign (coder-venus-cc VENUS-254 investigation, 2026-07-15): transient RSC/prefetch network drop on mobile, caught by design as intended, no unguarded app fetch on that route. Down-tier/filter from errscan alert rail: rejection+'Failed to fetch'+framework-only-stack rows.