913fe8b0b3
Backend: - OverrideOrderRequest/Response Pydantic models with ticker, quantity, price validators - POST /api/trading/override/order endpoint (enqueue to Redis broker queue) - auto_register_symbol() module for untracked ticker registration via Symbol Registry - Unit tests (17) and property-based tests (3 x 100 examples) Frontend: - OverrideTradePanel component (order form + positions display) - Override tab in TradingEngine page with URL search param navigation - Override Trade button on Trading Controls page - useSubmitOverrideOrder mutation hook - MSW handler and 13 component/integration tests Steering: - Updated steering docs for Ubuntu dev machine with nvm/Node 24