This commit addresses issue #1354 by:
1. Fixing portals.json syntax error (duplicate params field)
2. Adding the Sovereign Sound Playground as a new portal
3. Including the complete playground application
Changes:
- Fixed JSON syntax error in portals.json (line 41-44)
- Added playground/playground.html - Complete interactive audio-visual experience
- Added playground/README.md - Documentation and usage guide
- Updated portals.json with playground portal entry
The playground portal is configured with:
- Online status
- Visitor access mode
- Local destination URL
- Creative tool portal type
This resolves the issue and provides a working playground accessible through the Nexus portal system.
