docs(skills): document gws-shared prerequisite for selective skill install

[nuthalapativarun]

Summary

The selective skill installation example was missing gws-shared, which is a required dependency for all service skills. Updated the docs to show gws-shared must be installed first.

Fixes #672

Checklist

• Documentation only — no code changes
• Changeset file added (patch bump)

[changeset-bot]

🦋 Changeset detected

Latest commit: e63b708

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 clarify that the gws-shared package is a required dependency for all service skills. By providing explicit instructions for installing this prerequisite, it ensures users correctly configure their environment when performing selective skill installations.

Highlights

• Documentation Update: Added gws-shared as a mandatory prerequisite for selective skill installation in the README.
• Changeset Inclusion: Added a new changeset file to track the documentation update for the CLI package.

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[gemini-code-assist]

Code Review

This pull request updates the README.md and adds a changeset to document that gws-shared is a required prerequisite that must be installed first when performing selective skill installations. There are no review comments, so I have no feedback to provide.