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Tested the cross-dataset frontier: MM-Fi-trained CSI representation does NOT transfer beneficially to NTU-Fi HAR (frozen probe 91.5% = random features 93%; full fine-tune 75% < probe). CSI reps are distribution-locked, same root cause as within-MM-Fi cross-subject/-env collapse. Caveat: NTU-Fi 6 coarse activities are an easy target (random->93%). Updates the study's cross-dataset limitation from 'untested' to this measured result. Co-Authored-By: claude-flow <ruv@ruv.net>