- Add .github/workflows/ci.yml: builds on Node 18/20/22 (npm ci, npm run build, npm pack --dry-run)
- Add .github/workflows/publish.yml: publishes to npm on v* tag (requires NPM_TOKEN secret)
- Fix build error: NodeConnectionType (enum) was renamed to NodeConnectionTypes (object) in current n8n-workflow API
- Commit package-lock.json so npm ci can run reproducibly
- README: add CI status, npm downloads, and GitHub stars badges

Pre-publish checklist:
- Configure NPM_TOKEN repository secret on GitHub before tagging v0.1.0
- Verify npm provenance is enabled (--provenance flag is set in publish.yml)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>