banner plot and mehtodlogy updates

paper/src/chapters/04-results.tex

@@ -64,6 +64,20 @@ In our complete training runs we logged $\approx 180$ days of net compute time.
     \label{fig:final_focus_revenue_by_alpha}
 \end{figure}
 
+\begin{figure}[ht]
+    \centering
+    \input{chapters/figures/results/includes/final/final_focus_coi_by_alpha.tex}
+    \caption{COI level curves by contamination for the final cohort. The shaded band marks the per-$\alpha$ gap between defended and baseline policies.}
+    \label{fig:final_focus_coi_by_alpha}
+\end{figure}
+
+\begin{figure}[ht]
+    \centering
+    \input{chapters/figures/results/includes/final/final_focus_coi_preservation_grid.tex}
+    \caption{COI preservation by product count at the contamination endpoints ($\alpha=0.0$ and $\alpha=1.0$). Bars report defended-minus-baseline mean COI level, with the zero line separating preservation from erosion.}
+    \label{fig:final_focus_coi_preservation_grid}
+\end{figure}
+
 \begin{figure}[ht]
     \centering
     \input{chapters/figures/results/includes/final/final_focus_revenue_delta.tex}