### run A: zero-trade walkforward (synthetic) — expect note, exit 0
aura: note: all 3 walk-forward windows recorded zero trades
# exitA=0
### run B: real sweep with a poison axis member — expect warning, exit 3
# exitB=3
aura: warning: cell (df772d885a1b9c6b46a6ea51ba1339f0f3ee5c22e47ac4a3c95867ebc9b3b9d2, EURUSD, [1577923200000, 1609451819999]) failed at stage 0: a member panicked: SMA length must be >= 1 — recorded, campaign continues