add gitignore for claude code and serena mcp

[slin1237]

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.

[gemini-code-assist]

Summary of Changes

Hello @slin1237, 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 focuses on refining the project's version control by updating the .gitignore file. The primary goal is to ensure that certain directories, specifically those related to 'claude' and 'serena', are no longer included in the Git repository, thereby maintaining a cleaner and more focused codebase.

Highlights

• Git Ignore Update: Added new entries to the .gitignore file to prevent specific directories from being tracked by Git.
• Claude and Serena Directories: Specifically, the **/.claude/ and **/.serena/ directories are now ignored, likely to exclude temporary files or build artifacts associated with these tools or projects.

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[gemini-code-assist]

Code Review

This pull request adds entries to the .gitignore file to ignore .claude/ and .serena/ directories. The change is straightforward, but the file is missing a final newline character, which is a common convention for text files. I've added a suggestion to include it for better compatibility with various tools.

[gemini-code-assist]

It's a good practice for text files to end with a single newline character. This avoids potential issues with some command-line tools and scripts, and it's required by POSIX standards for a file to be considered a text file. Please add a newline at the end of the file.

**/.serena/