Fix CI build by using public npm registry in package-lock.json

The package-lock.json contained references to Anthropic's internal
artifactory registry which GitHub Actions cannot access, causing
npm ci to fail. Regenerated with public registry.npmjs.org.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: bhosmer-ant