Enh: Add Graphite to setup script

[bniladridas]

Summary

Add Graphite CLI tool installation to the macOS setup script.

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Changes

• Added brew install for Graphite in setup-mac.sh

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All installations tested locally.

[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 streamlines the developer setup process on macOS by automating the installation of the Graphite CLI tool. It integrates a new installation step into the existing setup script, ensuring that Graphite is readily available for users. Additionally, the project's version has been updated to reflect this enhancement.

Highlights

• Graphite CLI Installation: The macOS setup script (setup-mac.sh) now includes steps to install the Graphite CLI tool using Homebrew.
• Version Bump: The project version has been incremented from "1.5.12" to "1.5.13" in both the VERSION file and pubspec.yaml.

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[gemini-code-assist]

Code Review

This pull request adds the Graphite CLI tool to the macOS setup script, which is a useful enhancement. The implementation is straightforward, and the version numbers have been correctly updated. I have one suggestion to improve logging consistency within the script.