chore(ci): add changesets + ci validation

[avivkeller]

As we did in doc-kit.

Note that I added a require changesets + conventional commits not in doc-kit. I can remove them, but I feel that as we continously patch the UI, we may (I especially) forget to add changesets so it's good to have a reminder

The check will be non-required, so it's more of a "reminder" than a hard block

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Jul 22, 2026 7:05pm

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[cursor]

PR Summary

High Risk
This rewrites the npm release pipeline (version PR gating, publish timing, and Slack notifications), so a misconfiguration could block or incorrectly publish @node-core/* packages; CI changes also add new enforcement surface for every PR.

Overview
Publishing moves from a custom “detect version bumps + matrix publish” flow to Changesets: contributors add .changeset/ notes, merges to main open or update a chore: version packages PR, and only after that PR lands does CI build and changeset publish to npm. The Publish Packages workflow is collapsed into a single changesets/action job (fork-guarded, merge-queue verification kept); manual workflow_dispatch and per-package matrix publishing are removed. Root scripts add changeset, changeset:version, and release (build all packages/* then publish); per-package release scripts are dropped from published packages.

A new Pull Request Policy workflow runs pnpm changeset status --since origin/main on PRs (skipping the automated release branch) and enforces conventional-commit-style PR titles. Docs (package-publishing.md, code-style.md) and .changeset/ config (GitHub changelog, public access) document the process.

Crowdin sync no longer bumps @node-core/website-i18n with pnpm version patch; it writes a patch changeset when translation files change, and Crowdin PR/commit messages use chore(i18n): … conventional titles.

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[avivkeller]

cc @bmuenzenmeyer

[github-actions]

📦 Build Size Comparison

Summary

Metric	Value
Old Total First Load JS	10.65 MB
New Total First Load JS	10.65 MB
Delta	0 B (0.00%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.59%. Comparing base (7dac7d8) to head (398be8a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9020      +/-   ##
==========================================
+ Coverage   74.57%   74.59%   +0.02%     
==========================================
  Files         100      100              
  Lines        8803     8803              
  Branches      324      324              
==========================================
+ Hits         6565     6567       +2     
+ Misses       2234     2232       -2     
  Partials        4        4              

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