refactor(adaptive-strategy): remove dead code from execution, risk, and model modules
- execution/mod.rs: prefix 18 unused struct fields with _ (SlippageTracker,
SmartOrderRouter, TWAP, VWAP, MarketImpactModel fields)
- risk/mod.rs: prefix 5 unused PnLTracker/RiskMetricsCalculator fields,
remove #[allow(dead_code)] from DrawdownCalculator (fields are used),
delete entirely unused CorrelationMatrix struct
- models/traditional.rs: prefix config/ready on 4 stub model structs
- models/deep_learning.rs: prefix config/ready on 3 stub model structs
- 80/80 tests pass, zero warnings
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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