chore: add AI coding agent config files to .gitignore

[aftersnow]

Summary

• Add .gitignore entries for AI coding agent config files (Claude Code, Codex, Gemini CLI, Cursor, Windsurf, GitHub Copilot)
• Keeps the repository clean from tool-specific local configuration files

Test plan

• Verify .gitignore correctly ignores the listed files
• Confirm no existing tracked files are affected

[gemini-code-assist]

Summary of Changes

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This pull request focuses on maintaining a clean and organized repository by preventing the accidental tracking of local configuration files produced by AI coding agents. It introduces specific ignore patterns for common AI tool-related files and directories, ensuring that only relevant source code and project assets are managed by version control.

Highlights

• .gitignore updates: Added new entries to .gitignore to exclude configuration files and directories generated by various AI coding agents, including Claude Code, Codex, Gemini CLI, Cursor, Windsurf, and GitHub Copilot.

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[gemini-code-assist]

Code Review

This pull request adds several entries to the .gitignore file to ignore configuration files from various AI coding agents. While this is a good practice for keeping the repository clean from local configurations, one of the added entries, .github/copilot-instructions.md, is intended for repository-level configuration and should typically be version-controlled. Additionally, some other new entries are quite generic and might unintentionally ignore files that should be part of the repository.