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Add Roth (2022) paper review for PreTrendsPower methodology audit
PR-A of the 3-PR PreTrendsPower methodology review sequence (paper review -> implementation audit -> R parity goldens). Produces the structured methodology contract that will inform the PR-B audit of diff_diff/pretrends.py against the paper's exact equations. The review covers: - Propositions 1-4 (bias decomposition, sign-of-bias under monotone trend, variance decomposition, convexity gives variance reduction) - Power calculation algorithm for the slope gamma_p at target power p - Bias and coverage calculation framework (analytical via tmvtnorm-equivalent truncated MVN moments; simulation fallback) - Implementation notes and 11-item gaps list flagging items the PR-B audit will need to resolve (notably: NIS vs Wald acceptance region, violation-type extensions beyond linear, R-package version pin for parity) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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