fix(ci): AUT-1080 retry live NCCL watchdog timeouts - #6054
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Background
GB200 job 89828563718 hung on a transient NCCL collective timeout. Validation also showed live cancellation must not intercept tests that intentionally inject retryable failures.
What changed
Details
Live cancellation is limited to the hang-prone watchdog signature. Ordinary failures, including the persistent-rerun test’s injected NaN, finish normally before the existing retry classifier runs. Companion: NVIDIA-NeMo/Run#570.
Tested