[Phase 3] Confirm npm publish access and publish v0.1.0

[Robinsonchiziterem]

Summary

Verify that the @stellarroute npm scope is registered, add NPM_TOKEN to GitHub repository secrets, push a v0.1.0 tag, and confirm the package lands on the npm registry.

Acceptance Criteria

• @stellarroute scope exists on npm (or is created)
• NPM_TOKEN secret is set in GitHub repo settings
• git tag v0.1.0 && git push origin v0.1.0 triggers the publish workflow
• npm install @stellarroute/route-visualizer works from the registry

Drip Wave

Complexity: Medium — 150 pts
Phase: 3 — Production Hardening