NPM publish workflow

[AmyJZhao]

Description

Add github workflows for publishing contracts packages to public NPM
Publishing process: https://github.com/adobe/uix-contracts/blob/aa75a901bcc52fe5f4bb8ea379a57a048dde8e2f/PUBLISHING.md

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Copilot]

Pull Request Overview

This PR sets up an automated NPM publishing workflow using Changesets for version management and package publishing. The changes prepare four packages for publication to NPM while reorganizing internal dependencies to use a private workspace package naming convention.

Key Changes

• Configured Changesets for automated versioning and publishing workflow
• Renamed internal config package from @adobe/uix-config to @repo/uix-config to prevent accidental publishing
• Reset publishable package versions to 0.0.1 and added NPM publish configuration

Reviewed Changes

Copilot reviewed 18 out of 21 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Added Changesets CLI dependency and npm scripts for versioning and publishing
.changeset/config.json	Configured Changesets with public access and ignored internal packages
.changeset/README.md	Standard Changesets documentation
.github/workflows/publish.yml	GitHub Actions workflow for automated publishing to NPM
.github/workflows/changeset-check.yml	CI check to enforce changeset creation on PRs
PUBLISHING.md	Comprehensive documentation for the publishing workflow
packages/typescript-config/package.json	Renamed to @repo/uix-config and removed public access config
packages/*/package.json	Updated to version 0.0.1, added publishConfig, and updated config dependency references
packages/*/tsconfig.json	Updated to reference renamed @repo/uix-config package
packages/commons-contract/src/index.ts	Added export for contentFragment.js module

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[kokoc]

LGTM