CHANGES:
1. README.md:
- Added "3D Verification Checklist" section
- Important note: must click "3D Digital Twin" toggle first
- Desktop Chrome manual verification steps
- Mobile verification checklist
2. BLACK_SCREEN_FIX_REPORT.md:
- Updated Visual QA section with detailed test steps
- Test 1-5: Initial load → 2D fallback → 3D toggle → Auto demo in 3D
- Clarified: Browser MCP verified both 2D and 3D modes
- Removed false claims, added honest limitations
VERIFIED (Browser MCP):
- ✅ 2D fallback works
- ✅ 3D scene renders (WebGL available, FPS ~60)
- ✅ Auto demo runs in 3D mode
- ✅ NO BLACK SCREEN in both modes
NOT VERIFIED (Requires manual check):
- ⚠️ Desktop Chrome real device
- ⚠️ Mobile real device (<640px)
- ⚠️ STL model loading in production
CONCLUSION:
Black screen fix is solid (ErrorBoundary + throttled RAF works).
3D rendering confirmed via browser MCP.
Full production verification requires desktop/mobile real device testing.
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