Full 1.1M ES bars verified working (no NaN, loss converges 20→8) but
takes 20min in debug mode (14K steps/epoch). Cap at 5000 bars for fast
smoketest (62 steps/epoch × 10 epochs ≈ 6s). H100 release handles full set.
Features confirmed normalized: mean≈0, std≈1, max<6 (z-scored at precompute).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>