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Derive absolute standard deviation from relative stdev and mean when nv/cold/time/gpu/stdev/absolute is absent. This lets older JSON files that only contain mean and relative stdev still construct timing intervals. Also allow mean/stdev intervals to be built without min/max summaries, using min/max only as optional clipping bounds when present. This restores SAME classification for legacy fixture data instead of treating those rows as missing-interval AMBG cases. Update nvbench_compare tests to cover derived stdev handling and the legacy mean/stdev comparison path.