chore: add release-prep script and update README

[thomasthachil]

Summary

• Adds yarn release-prep script that runs changeset + changeset version together for a single-PR release workflow
• Updates README with new step documenting both one-PR and two-PR release approaches
• Adds release-prep to the quick reference table

Test plan

• Verify yarn release-prep runs the interactive changeset CLI followed by version bumping
• Confirm README renders correctly on GitHub

[github-actions]

🤖 Claude Code Review

✅ Review complete

Summary

This PR adds a release-prep script that combines changeset + changeset version into a single command, enabling a one-PR workflow for version bumps. The README is updated to document this optional workflow.

Review

The changes are clean and straightforward:

1. package.json: Adds "release-prep": "changeset && changeset version" - a simple shell command chaining two existing scripts.

2. README.md: Documents the new workflow as optional step 3, renumbering subsequent steps and adding the command to the quick reference table.

No issues found. The script is simple, uses existing tooling, and the documentation is clear.

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[github-actions]

📋 Review verdict: APPROVE

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This formal review submission is for the verdict only.

[graphite-app]

Graphite Automations

"Request reviewers once CI passes on sdks monorepo" took an action on this PR • (03/13/26)

3 reviewers were added and 1 assignee was added to this PR based on Siyu Jiang (See-You John)'s automation.