Introduces ml/src/types/ohlcv.rs as the single source of truth for
OHLCVBar (DateTime<Utc>, f64). Replaces 13 identical struct definitions
scattered across features/, regime/, real_data_loader, and evaluation/.
The f32 backtesting variant in evaluation/metrics.rs is renamed to
OHLCVBarF32 to distinguish it from the canonical type. The regime_adx.rs
i64-timestamp variant was safely migrated since its timestamp field was
never accessed. The orchestrator's Bar alias is replaced with OHLCVBar.
39 files changed, -151 net lines removed.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
533459570b