feat: classify swaps via function selector matching

[premiumjibles]

Summary

• Add KNOWN_SWAP_SELECTORS set (~25 selectors covering Uniswap V2/V3, Universal Router, 1inch, 0x, CowSwap, Paraswap, THORChain) as a secondary classification signal when token transfers are empty
• Fix null safety for selector-matched swaps (tokenTransfers! → tokenTransfers ?? [])
• Update enrichment guard to process swap-typed txs that lack token data, so they still get enriched from known transaction records

Test plan

• Swap selector with no tokenTransfers → type swap, tokenTransfers []
• Token-transfer classification takes priority over selector
• Unknown selector → still contract
• Short inputData (< 10 chars) → no crash, falls through
• Case-insensitive selector matching
• Selector-matched swap with empty tokenTransfers + known tx → gets enriched
• Swap with existing tokenTransfers + known tx → preserves original data
• All 842 tests pass

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
shapeshift-agentic	Ready	Preview, Comment	Mar 19, 2026 2:35am

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