7b5c27df8c
Adds tdcs_paper_lme replicating the paper's exact formula/variable names (paper_* switch cases): mergeA2 reproduces the interaction F(1)=7.09 vs 7.12, p=0.009 vs 0.008, with a coverage-confound warning. Rewrites tdcs_power_sim to fit that same formula (interaction term canonicalized to day:stim). Adds a replication test. Suite 37/37. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>