chore: update .gitignore to include common AI agent markdown files

[lingzhong]

This PR updates the .gitignore file to consistently ignore common AI agent markdown files (AGENTS.md, CLAUDE.md, GEMINI.md) for a unified approach to managing agent-specific documentation and a cleaner repository.

[gemini-code-assist]

Summary of Changes

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This pull request refines the repository's .gitignore configuration to enhance version control hygiene. The update specifically targets markdown files commonly generated by various AI coding assistants, ensuring these temporary or generated outputs are automatically excluded from commits. This change helps maintain a cleaner and more focused repository history.

Highlights

• .gitignore Update: The .gitignore file has been updated to include common markdown files generated by AI coding agents. This prevents files such as AGENTS.md, CLAUDE.md, and GEMINI.md from being committed to the repository.

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[gemini-code-assist]

Code Review

This pull request updates the .gitignore file to add entries for common AI agent markdown files. The changes are a good improvement. I've provided one suggestion to make the ignore patterns more robust by considering case-insensitivity, which will help prevent accidental commits across different developer operating systems.

[jorellis]

Should we include case sensitive versions and directories as well?
e.g.

GEMINI.md
gemini.md
.gemini/