Function lookup_order_intent 

pub fn lookup_order_intent(
    state: &PortfolioState,
    batch_intent_cache: &HashMap<OrderId, ClientIntentId>,
    order_id: &OrderId,
) -> Option<ClientIntentId>

Resolve originating ClientIntentId for an order lifecycle event.

Prefers the batch-local cache (for Ack/Fill in the same execution poll), then falls back to open_orders, then terminal_order_attribution.

Shared between the live runner and the backtest engine (PARITY).