fix: HIGH severity bugs in checkpointing I/O timing, MPI collection, and submission validation#397

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FileSystemGuy-SC-high

Commits on May 27, 2026

fix(SC-1..SC-5): correct five I/O measurement bugs in streaming_checkpoint.py
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fix(SC-1,SC-2): remove async I/O timing gap and memcpy from minio_writer.py
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fix(SC-1,SC-2): remove async I/O timing gap and memcpy from s3torch_writer.py
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fix(MPI-1): raise on non-zero mpirun exit instead of returning partial data
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fix(RULES-3): replace undefined model_key with model_name in subset-mode check
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fix(RULES-1,RULES-2,RULES-4): correct three submission checker bugs in training_checks.py
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fix(RULES-5): guard against KeyError on parquet datasets in rules_legacy.py
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