docs: update installation instructions to prioritize github releases

[jpoehnelt]

Updates README.md and crates/google-workspace-cli/README.md to point users to download pre-built binaries directly from GitHub Releases as the primary installation method.

The existing npm install package manager methods are preserved but clarified as convenience layers.

Addresses part of the supply chain review action items.

[changeset-bot]

🦋 Changeset detected

Latest commit: 87d51eb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@googleworkspace/cli	Patch

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[gemini-code-assist]

Summary of Changes

Hello, 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 updates the project documentation to improve security and supply chain practices by steering users toward direct binary downloads from GitHub Releases. The changes clarify the role of existing package manager installation methods while maintaining their availability for user convenience.

Highlights

• Installation Priority: Updated documentation to recommend downloading pre-built binaries directly from GitHub Releases as the primary installation method.
• Package Manager Clarification: Reframed npm and other package manager installation methods as convenience layers rather than the primary installation path.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to prioritize GitHub Releases as the primary installation method for the @googleworkspace/cli tool. It modifies the main README.md and the crate-specific README.md to recommend downloading pre-built binaries directly, while clarifying that the npm package serves as a convenience wrapper for these binaries. I have no feedback to provide.

[googleworkspace-bot]

/gemini review

[gemini-code-assist]

Code Review

This pull request updates the documentation across the repository to prioritize GitHub Releases as the primary installation method for the Google Workspace CLI, positioning npm as a convenience wrapper for downloading those binaries. I have no feedback to provide.