feat: add GitHub Actions workflows for npm publishing

[henrypalacios]

Summary

Adds automated NPM publishing with security features:

• CI workflow with dependency review and CodeQL scanning
• Publish workflow with npm provenance (automatic on merge to main)
• Migrates from npm to pnpm with frozen lockfiles
• Security: pinned actions, minimal permissions, mandatory audits

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[github-actions]

Dependency Review

The following issues were found:

• ❌ 10 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ✅ 0 package(s) with unknown licenses.
• ⚠️ 135 packages with OpenSSF Scorecard issues.

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