Greenfield Phase 1 plan addressing temporal receptive field mismatch (auc_h1000=0.576 plateau): replace seq_len=32 raw-tick input with 3-scale aggregation [(1,10), (30,10), (100,12)] covering 1510 ticks. 10 tasks total, executed via subagent-driven development. Falsifiable gate: auc_h1000 >= 0.65 on clean front-month data.