- --diag-every N (default 100): skip device readback on non-diag steps.
Eliminates ~10 stream.sync per step → ~2× throughput at large batch.
- Fix PnL bug: was accumulating raw_rewards (shaped, all batches) instead
of rewards/scale on done steps only.
- Wire diag-every=100 in Argo template (diag JSONL every 100 steps).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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