docs: add graphite integration and refine features

[bniladridas]

Summary

• Added Graphite workflow tool documentation to README with usage examples and PR review link
• Refined Features section for better clarity and conciseness
• Created AGENTS.md with lint command for agent reference

These changes enhance documentation and tooling for the dotfiles repo.

[gemini-code-assist]

Summary of Changes

Hello @bniladridas, 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 significantly enhances the documentation and tooling within the repository. It introduces comprehensive guidance for utilizing the Graphite workflow tool, streamlines the description of existing features for better readability, and establishes a dedicated document for agent-specific linting instructions, collectively improving the clarity and usability of the project's resources.

Highlights

• Graphite Integration Documentation: Added a new section to the README.md detailing the Graphite workflow tool, including its benefits, key commands, and links for PR reviews and advanced usage.
• Refined Features Section: The 'Features' section in README.md has been updated for improved clarity and conciseness, rephrasing existing points and incorporating Graphite as a new feature.
• New Agent Instructions File: A new file, AGENTS.md, was created to provide specific instructions for agents, including a command for linting the codebase.

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[gemini-code-assist]

Code Review

This pull request does a great job of improving the documentation by adding details about the Graphite workflow and refining the features list for better clarity. The new AGENTS.md file is also a helpful addition.

My review includes a few suggestions to further enhance the readability and consistency of the documentation, mainly around using standard conventions for placeholders in command examples and formatting technical terms in markdown. These are minor changes aimed at making the documentation even more user-friendly.