Check C - Entry-Vector Set Separation Recheck

Verdict: ENTRY_VECTOR_SEPARATION_ACCEPTED

DOT/scheduler/trigger/event-trigger/external vectors live only in U_entry_vector. They are evaluated through bypass/reachability coverage, not object uniform-end-state membership. Uncovered vector-to-protected-target reachability fails closed. Operator-gated controls and all execution blocks remain intact.

No remaining Check-C blocker.