Two-stage pre-screen for Affine (netuid 120) so no hotkey is spent on a
checkpoint that was never going to crown.
Contract facts this is built on (verified against the live chain, 2026-08-08):
one submission per hotkey ever; crown needs paired margin > 3·se and
0.02; 4 of 271 submissions have ever been accepted.
Why two stages
The ranking term is S = Λ2 + w·clip(L1lift, ±0.1).
