test(universal-router-sdk): add exact output ETH-WETH split route test

[dianakocsis]

PR Scope

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• fix(SDK name): will trigger a patch version
• chore(<type>): will not trigger any release and should be used for internal repo changes
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• feat(breaking): will trigger a major version for a breaking change

Description

[Summary of the change, motivation, and context]

How Has This Been Tested?

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Are there any breaking changes?

[e.g. Type definitions, API definitions]

If there are breaking changes, please ensure you bump the major version Bump the major version (by using the title feat(breaking): ...), post a notice in #eng-sdks, and explicitly notify all Uniswap Labs consumers of the SDK.

(Optional) Feedback Focus

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(Optional) Follow Ups

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✨ Claude-Generated Content

Description

Adds a test case for exact output split routes that end in ETH-WETH pools. This test validates the encoding of split routes where both V3 and V4 trades output ETH, with the V4 route going through an ETH-WETH pool.

Changes

• Added test encodes an exact output ending in ETH-WETH in sdks/universal-router-sdk/test/uniswapTrades.test.ts
  • Tests V3 route: USDC -> WETH -> ETH (via unwrap)
  • Tests V4 route: USDC -> ETH -> ETH-WETH pool -> ETH
  • Registers fixture _UNISWAP_SPLIT_TWO_ROUTES_ENDING_IN_ETH_WETH
• Added temporary SDK tarballs in sdks/tmp/ for local testing (router-sdk.tgz, v4-sdk.tgz)

How Has This Been Tested?

Unit test added to verify the encoding of exact output split routes ending in ETH-WETH pools.

Are there any breaking changes?

No

Notes

This PR includes temporary tgz files in sdks/tmp/ that appear to be debugging artifacts and may need to be removed before merging.