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The model already evaluates the tDCS main effect at day 0, which is the paper's 'Day 1'; relabel the report/docstring to state the equivalence explicitly so the 'equal on Day 1' comparison is unambiguous. No model change (re-indexing day would move the main-effect evaluation point off Day 1). Suite 31/31. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>