Merge feat/production-hardening: resolve 53 TODOs across 5 phases
Phase 1: ML pipeline verification (checkpoint roundtrip tests, feature pipeline tests, DQN VarMap bug fix, deleted 585 lines dead code)
Phase 2: Service production logic (real portfolio metrics, VaR positions, proto population, safetensors loading, shutdown handling)
Phase 3: Backtesting & data (equity curve, DBN metadata, progress callbacks, cross-symbol validation, event filtering)
Phase 4: ML crate TODOs (statrs t-distribution, quantization savings, safetensors header, microstructure features, 45-action masking, confidence EMA, AttentionMask)
Phase 5: Infrastructure/cleanup (TLS/OCSP docs, compliance roadmap, metrics docs, regime features, execution roadmap, auth #[ignore], chaos docs)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
a51fe0d30d