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Document Box-A2 as an a-priori sham/sensory control and the two-tier analysis it implies: B2-vs-A2 as the primary sensation-controlled contrast, and the pooled-control mergeNaive grouping as a confirmatory power-boost licensed by A2/Naive exchangeability (with the TOST caveat that the exchangeability is supported but not proven at n=3-4). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>