T15: training rewrite mirroring T14 eval. N_par parallel envs
lockstep H steps per epoch; ONE batched C51 update at B = N_par * H.
Expected ~15× speedup vs sequential.
- NEW kernel alpha_h_enriched_store_batched_kernel for batched
h_enriched slot writes
- Training section greenfielded: legacy sequential loop deleted
- CLI flag --n-train-par (default 50)
- Terminal next-state slot zeroed; done=1 at horizon masks Q_next
contribution in Bellman projection — no terminal Mamba2 forward
- docs/isv-slots.md updated per kernel-audit-doc hook
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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