Bot Engine: order manager, inventory ledger, event routing, and polling.
This crate contains the runtime that:
- Manages order state (in-memory source of truth)
- Tracks inventory/balances with reservations
- Routes events to strategies
- Handles rate limiting and backoff
- Manages exchange health state machine
- Polling loop for fills and quotes (native only)
- Trade syncing to upstream API for PnL tracking (native only)