pub const GDN_CARRY_CAP: usize = 8;Expand description
2026-09-26: Rows the carry stash holds per (layer, slot): CARRY_CAP in
gated_delta_rule_carry.cu. A verify whose K rows might not fit behind the pending ones
(pending + K > GDN_CARRY_CAP) writes the state back and restarts the stash.