Add developer tooling: .gitignore, .clang-format, pre-commit

[rsasaki0109]

Summary

• Expand .gitignore to cover ROS workspace artifacts (build/, install/, log/), compiled binaries, IDE files, and OS files
• Add .clang-format based on Google style (C++17, column limit 100)
• Add .pre-commit-config.yaml with hooks for trailing whitespace, clang-format, and cmake-format

How to set up pre-commit locally

pip install pre-commit
pre-commit install

[windsurf-bot]

💡 To request another review, post a new comment with "/windsurf-review".

[windsurf-bot]

Consider setting SortIncludes: true to automatically organize include statements. This is generally considered a best practice and would be more consistent with the Google style guide that this configuration is based on.