ci(release): publish npm alphas under alpha tag

[omerakben]

Summary

• Publish npm prerelease versions with the explicit alpha dist-tag
• Document alpha dist-tag verification in release readiness

Why

• The first npm-publish workflow run reached the publish step and npm rejected the prerelease without an explicit tag:
  npm error You must specify a tag using --tag when publishing a prerelease version.

Validation

• npm publish --dry-run --access public --tag alpha
• ruby -e "require 'yaml'; YAML.load_file('.github/workflows/npm-publish.yml'); puts 'yaml ok'"\n- git diff --check\n\n## Risks / follow-ups\n- After merge, rerun npm-publish.yml with version=0.21.2-alpha.0\n- If npm trusted publishing is not configured, the next failure should be npm OIDC/trusted-publisher authorization rather than package shape\n

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 49becf53-ea6e-4d29-8b7b-49ddf8f76a7a

📥 Commits

Reviewing files that changed from the base of the PR and between f9491c5 and 505b9fa.

📒 Files selected for processing (2)

• .github/workflows/npm-publish.yml
• docs/RELEASE_READINESS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/npm-alpha-dist-tag

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[gemini-code-assist]

Code Review

This pull request updates the release readiness documentation (docs/RELEASE_READINESS.md) to include instructions for viewing npm distribution tags and explicitly using the --tag alpha flag when publishing alpha versions locally. It also clarifies that alpha versions are published under the alpha dist-tag rather than latest. There are no review comments to address, so no additional feedback is provided.

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[Copilot]

Pull request overview

Updates the npm publishing workflow and release-readiness documentation so prerelease (alpha) versions can be published successfully by using an explicit alpha dist-tag, aligning with npm’s requirement for prerelease publishing.

Changes:

• Update GitHub Actions npm publish step to include an alpha dist-tag.
• Document dist-tag verification and local publish instructions for alpha releases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/RELEASE_READINESS.md	Adds guidance to verify npm dist-tags and updates local publish instructions to use --tag alpha.
.github/workflows/npm-publish.yml	Adds --tag alpha to the npm publish command in the GitHub Actions workflow.

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