build: 🎯 Optimize bundle size - exclude test/docs

- Changed from catch-all to explicit whitelist
- Excluded test/, docs/, audit reports from bundle
- Kept ambient_loop.mp3 (essential feature!)
- Final DMG: 131MB (down from 132MB)

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

Co-Authored-By: Claude <[email protected]>