chore(universal-router-sdk): add mock pools and test for V4 split routes

[jsy1218]

PR Scope

Please title your PR according to the following types and scopes following conventional commits:

• fix(SDK name): will trigger a patch version
• chore(<type>): will not trigger any release and should be used for internal repo changes
• <type>(public): will trigger a patch version for non-code changes (e.g. README changes)
• feat(SDK name): will trigger a minor version
• feat(breaking): will trigger a major version for a breaking change

Description

[Summary of the change, motivation, and context]

How Has This Been Tested?

[e.g. Manually, E2E tests, unit tests, Storybook]

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

[Specific parts of this PR you'd like feedback on, or that reviewers should pay closer attention to]

(Optional) Follow Ups

[Things that weren't addressed in this PR, ways you plan to build on this work, or other ways this work could be extended]

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✨ Claude-Generated Content

PR Scope

Please title your PR according to the following types and scopes following conventional commits:

• fix(SDK name): will trigger a patch version
• chore(<type>): will not trigger any release and should be used for internal repo changes
• <type>(public): will trigger a patch version for non-code changes (e.g. README changes)
• feat(SDK name): will trigger a minor version
• feat(breaking): will trigger a major version for a breaking change

Description

Adds test infrastructure for V4 split route calldata encoding in universal-router-sdk to support guidestar routes testing. This includes new mock tokens, mock V4 pools, and a test case verifying that split routes across multiple V4 pools encode correctly.

Changes

• Added USDT and UNI token definitions to test/utils/uniswapData.ts
• Added new mock V4 pools: ETH_USDT_V4, USDC_USDT_V4 in uniswapTrades.test.ts
• Added test case: encodes a split exactInput with 2 routes v4 USDC -> USDT, v4 USDC -> ETH -> USDT
• Fixed duplicate parseUnits import in uniswapTrades.test.ts
• Changed @uniswap/router-sdk dependency to local tarball tmp/router-sdk-guidestar-routes-1.tgz for testing
• Modified router-sdk pool duplication check to support guidestar routes with shared pools

How Has This Been Tested?

Unit tests - the new test case validates split V4 route calldata encoding for USDC → USDT (single hop) and USDC → ETH → USDT (multi-hop) routes.

Are there any breaking changes?

No - test-only changes with a local dependency for development/testing purposes.

(Optional) Feedback Focus

This PR uses a local router-sdk tarball with modified behavior for pool duplication validation. Review whether this approach is appropriate for testing guidestar routes.

(Optional) Follow Ups

• Replace local tarball with published router-sdk version once guidestar routes support is released
• Consider adding more test cases for other guidestar route patterns

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​uniswap/​router-sdk@​0.0.0

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