- Add a Per-Job Environment section explaining that runtime.environment reaches only the GPUs declared in the same job YAML, with one-YAML-per-GPU-group examples for local, cross-PCIe workaround, and NVSwitch NVLink tuning setups
- Replace the NCCL workaround pair in the runtime schema example with ASTR_LOG_LEVEL and ASTR_BACKEND and document value semantics (str() rendering, null exports empty, no host-shell passthrough)
- Comment out the blanket NCCL exports in the get-started multi-GPU example so they are opt-in per docs/guides/distributed.md
- Add a hard rule against copying NCCL workarounds into every training config
ViperEkura
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