Updated all fixed-size arrays across monitoring.rs, financials.rs,
metrics.rs, training_loop.rs from [_;5]→[_;9] and [_;45]→[_;81].
DIRECTION_LUT expanded to 9 levels (-1.0 to +1.0 in 0.25 steps).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>