Returns the actionable BUY / SELL trade calls across the top-N perpetual-futures markets by open interest on a venue — each with a 0–100 confidence and the current market regime — so an agent can scan the whole board in one call instead of polling symbols one-by-one. HOLD markets are excluded by default; flat per-scan price. Read-only market scan, informational only. Use when an agent wants the best setups across many markets at once; for one specific market use `get_trade_signal`.