Fix uniswapx trades

[henrystats]

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Description:

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• README.md
• spellbook docs
• CONTRIBUTING.md

[cursor]

PR Summary

Refactors UniswapX trades to improve correctness and modeling clarity.

• Introduces enriched, incremental uniswapx_trades per chain: uniswap_arbitrum_uniswapx_trades, uniswap_base_uniswapx_trades, uniswap_ethereum_uniswapx_trades, uniswap_unichain_uniswapx_trades (all using enrich_dex_trades over respective *_uniswapx_base_trades)
• Replaces uniswap.uniswapx_trades with a view that unions the per-chain models and updates expose_spells to project-level "uniswap"
• Removes deprecated uniswap_uniswapx_base_trades.sql union
• Updates schema configs/metadata and adds/aligns uniqueness tests to include block_month for uniswap_uniswapx_trades and per-chain counterparts

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