hotfix: remove uv.lock and add it to .gitignore

[yzh119]

📌 Description

uv.lock should not be part of the package (it was introduced by accident in #2387, this PR removes uv.lock and add it to .gitignore to prevent accidental commits.

Lock files are not recommended for libraries as they can conflict with downstream users' environments.

🔍 Related Issues

#2387

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Reviewer Notes

This PR itself should not involve any changes related to kernels and we can bypass kernel CI checks.

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[gemini-code-assist]

Summary of Changes

Hello @yzh119, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where a uv.lock file was inadvertently committed to the repository. The core purpose of this change is to remove this lock file and establish a mechanism to prevent its reintroduction, ensuring that the library maintains compatibility and avoids potential dependency conflicts for its consumers.

Highlights

• Removal of uv.lock: The uv.lock file, which was accidentally introduced in a previous pull request (A Blackwell-optimized version of selective_state_update (mamba) #2387), has been removed from the repository.
• Preventing future uv.lock commits: The uv.lock file has been added to the .gitignore file to prevent it from being accidentally committed again in the future.
• Reason for removal: Lock files are generally not recommended for libraries as they can lead to conflicts with the dependency environments of downstream users.

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[gemini-code-assist]

Code Review

This pull request correctly addresses the issue of a committed lock file in a library. By removing uv.lock and adding it to .gitignore, you are following the best practice for Python libraries, which helps prevent dependency conflicts for downstream users. The change to .gitignore is well-placed and includes a helpful comment explaining the reasoning. This is a solid hotfix that improves the project's maintainability.