chunk_header: saturated (203.9M execs, ~350k exec/s, 33 fork jobs clean); envelope_frame: 2119 edges/1664 corpus entries, still growing at budget end, 7.08M execs, 33 fork jobs clean. No crash/OOM/timeout artifacts in either 10-min detached campaign; exit 0 both. Grown corpus not merged (per \u00a77.1 corpus policy). Doc-only change.