- signal_indicators table: added strategy column
- Each strategy gets its own row per cycle
- API /api/signals/latest?strategy=v51_baseline|v52_8signals
- API /api/signals/signal-history?strategy=...
- V5.1 page reads v51_baseline data, V5.2 reads v52_8signals
- Now V5.1 and V5.2 show truly independent scores