Gate build_gate_order_params returns {} which is falsy; params or None broke trend_market_add with NoneType is not iterable while first-leg place_exchange_order worked.
Co-authored-by: Cursor <cursoragent@cursor.com>
Env POSITION_SIZING_MODE switches risk vs full-margin (available*buffer, BTC/ETH 10x). Blocks trend/roll/key auto opens in full margin, purges breakout/fib monitors with WeChat notice, keeps RR check and initial SL snapshot for records.
Co-authored-by: Cursor <cursoragent@cursor.com>