ci: changesets migration

[soberm]

Description of changes

This PR migrates the release workflow from Lerna to Changesets, providing a more modern and flexible approach to version management and package publishing. The migration includes:

New Changesets Configuration:

• Configured Changesets for independent versioning of packages
• Added .changeset/config.json with settings for changelog generation, commit messages, and versioning strategy
• Created custom changeset preset for bumping all packages together when needed

New GitHub Actions Workflows:

1. Version Packages Workflow (.github/workflows/version-packages.yml)

   • Creates automated "Version Packages" PRs when changesets are detected
   • Runs on pushes to main and hotfix branches
   • Generates changelogs and updates package versions

2. Release Latest Workflow (.github/workflows/release-latest.yml)

   • Publishes packages to npm with latest tag when Version Packages PR is merged to main
   • Runs release verification tests before publishing
   • Updates API documentation (local and external) after successful publish

3. Release Hotfix Workflow (.github/workflows/release-hotfix.yml)

   • Publishes hotfix releases from the hotfix branch
   • Automatically creates a PR to merge hotfix changes back into main

4. Release Unstable Workflow (.github/workflows/release-unstable.yml)

   • Publishes packages to npm with unstable tag from the main branch
   • Creates snapshot versions with git hash (e.g., x.x.x-unstable-a71ee35-20260128091132 )
   • Skips release if commit message contains [skip release]

5. Release Preid Workflow (.github/workflows/release-preid.yml)

   • Publishes packages with custom pre-release identifiers
   • Supports branches matching feat/preid/* pattern
   • Extracts preid from branch name and validates against forbidden list
   • Creates snapshot versions with preid and git hash (e.g., x.x.x-preid-a71ee35-20260128091132)

New GitHub Action:

• Created has-changesets action to detect unconsumed changesets in the repository

Package.json Updates:

• Added @changesets/cli dependency
• Updated publish npm scripts

Issue #, if available

Related to the changesets migration initiative.

Description of how you validated changes

• Run publish scripts locally to check if tags and versions are correct
• Run preid release workflow on GitHub.

Checklist

• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

Checklist for repo maintainers

• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows
• New source file paths included in this PR have