digdigdig3 0.3.3

Unified async Rust API for 47 exchange connectors (REST + WebSocket). The core layer — pure ExchangeHub + connectors. Higher-level builder, persistence, replay, OB tracker live in `digdigdig3-station`.
Documentation 
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//! ConnectorAggregator — fan-out helper over ConnectorPool.
//!
//! Intentionally empty: aggregation logic is now handled by `ExchangeHub`.
//! Module retained for future use.