1. Margin ratio calculated on per_symbol_balance instead of total balance
— previously amplified margin reduction by num_symbols factor
2. Replace Algo Order API (algoType=CONDITIONAL) with standard
futures_create_order for SL/TP — algo API is for VP/TWAP, not
conditional orders; SL/TP may have silently failed
3. Fallback PnL (SYNC close) now sums all recent income rows instead
of using only the last entry — prevents daily_pnl corruption in
multi-fill scenarios
4. Explicit state transition in _close_and_reenter — clear local
position state after close order to prevent race with User Data
Stream callback on position count
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
