[Bug]: Swap direction lost when tracker resolves before terminal event

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[Bug]: Swap direction lost when tracker resolves before terminal contract event

Description

SwapTracker.resolve() drops swaps from active when voting completes, but ContractEventWatcher later needs (from_chain, to_chain) when SwapCompleted / SwapTimedOut fires. Without a cache, direction lookup returns empty strings and outcome scoring mis-labels the swap.

Steps to reproduce

1. Validator votes on a swap and resolve() runs before the terminal SwapCompleted event is replayed.
2. Observe outcome insertion using _lookup_swap_direction.

Expected behavior

Direction remains available until the terminal event is processed.

Actual behavior

Empty direction in stored swap outcomes.

Impact

Incorrect credibility / scoring attribution for resolved swaps.