1\begin{table}[htbp]\centering\footnotesize2\caption{Validation of the cross-merchant matching tiers (60 pairs per tier)}\label{tab:match_val}3\begin{adjustbox}{max width=\textwidth}4\begin{tabular}{lrrrr}\toprule5Tier & Pairs with consensus & Same product & Different & Same product, comparable-variant pairs \\\midrule6A & 56 & 0.98 & 0.02 & 0.98 \\7B & 54 & 1.00 & 0.00 & 1.00 \\8C & 52 & 0.89 & 0.12 & 0.85 \\9D & 48 & 0.21 & 0.75 & 0.23 \\10\bottomrule\end{tabular}11\end{adjustbox}12\begin{minipage}{0.95\textwidth}\vspace{2pt}\footnotesize\textit{Notes:} Two independent LLM annotators (agreement 0.88; consensus on 88\% of pairs). Tier A = shared merchant SKU; B = same brand and identical normalised title; C = same brand, fuzzy title; D = identical title without brand (never used for inference).\end{minipage}13\end{table}14