- New page 06_dev_preview.py: interactive ML model showcase
- All 12 models initialized from synthetic data with live charts
- Live Auction Simulator: bandit + opponent model + budget optimizer
- Tabbed UI: 6 tabs, one per phase
- Resilient warehouse: returns typed empty DataFrames when no data
- Dev Preview set as default landing page for demo mode
- Live at http://localhost:8507
ramseshk