ci: add release workflow that publishes on v* tag push

[phanan]

Summary

Adds .github/workflows/release.yml so that pushing a v* tag triggers npm publish. Without this, tags don't go anywhere — npm doesn't watch git tags by itself.

What it does

• Triggers on tags matching v* (e.g. v5.0.0, v5.1.0).
• Verifies the tag matches package.json#version — catches divergence early.
• Bumps npm to latest (trusted publishing requires npm ≥ 11.5.1; node 22 ships with npm 10).
• Runs pnpm test and pnpm build before publishing.
• npm publish --access public. No token. Auth is via npm trusted publishing (OIDC) — the workflow gets a short-lived token from npm scoped to this exact repo + workflow. Provenance is attached automatically.

Required setup on npm side (one-time)

Visit the package settings on npmjs.com → Trusted publishers → Add a publisher:

• Publisher: GitHub Actions
• Organization or user: phanan
• Repository: factoria
• Workflow filename: release.yml
• Environment name: (leave blank)

Once that's saved, no secret is needed in this repo.

Test plan

• Configure trusted publisher on npm (one-time)
• Merge this PR
• Tag and push v5.0.0 from master
• Confirm the Release workflow runs green and [email protected] appears on npm with provenance attestation

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9565261c-8b99-4b47-a57b-effef4c114b0

📥 Commits

Reviewing files that changed from the base of the PR and between 3803598 and aefe18d.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-release-workflow

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