Changesets v3 cuts install size by 88% and patches peer dependents

Changesets v3.0 has shipped, its first major release in seven years. Packages are now ESM-only and require Node.js 22.11+, install size dropped from 16.1MB to 2.1MB and dependencies from 95 to 39, and peer dependency updates now trigger a patch bump instead of a major one.

• Install size fell from 16.1MB to 2.1MB, dependencies from 95 to 39
• Requires Node.js 22.11+, pnpm 10, npm 10.9 or Yarn 4.5.2
• Peer dependency updates now give a patch bump instead of major
• CLI rebuilt on cac and clack, with new pack and publish-plan commands