Gateway Artifacts

The playground's active path is production-equivalent gateway loading:

1. Build each napplet as a single-file artifact.
2. Emit dist/index.html and dist/.nip5a-manifest.json.
3. Fetch manifest metadata through /napplet-gateway/<dTag>/manifest.json.
4. Register (dTag, aggregateHash) before iframe navigation.
5. Navigate to /napplet-gateway/<dTag>/<aggregateHash>/index.html.

This path keeps the iframe opaque-origin and avoids direct dev-server shortcuts. Use pnpm audit:gateway-artifacts to verify the artifact shape.