ProductionFeatureExtractorAdapter was changed to produce 42 features
(40 base + 2 regime) but three test sites and the FEATURE_NAMES constant
still expected 51 (42 + 1 volatility_regime + 8 OFI placeholders).
- backtesting: strategy_runner test assertions 51→42
- trading-service: ensemble_coordinator test assertions 51→42
- trading-service: FEATURE_NAMES_51 → FEATURE_NAMES_42 (drop OFI
placeholders and volatility_regime, matching extraction.rs v2 layout)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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