feat: upgrade paper trading to $100k moderate tier
Paper money has no downside — bigger capital exposes more model
behavior: position sizing, diversification, sector exposure,
correlation checks, circuit breakers, reserve pool siphoning,
and risk tier auto-adjustment all become meaningful.
- risk_tier: conservative → moderate (min_confidence 0.55)
- absolute_position_cap: $25 → $10,000
- max_open_positions: 5 → 10
- initial portfolio value: $500 → $100,000
- Updated migration 019, Helm values, and engine default