Connect Emperor Nexus retention to original Richese seller lots

game/bots.ts

@@ -2693,6 +2693,9 @@ function policyActions(g: GameView): Action[] {
     if (d.kind === 'nexusEmperorPayment')
       return [{ type: 'nexusEmperorPayment', event: d.event,
         use: !!g.nexusEmperorPayment?.canUse && !g.nexusEmperorPayment.blocked }];
+    if (d.kind === 'nexusEmperorSellerPurchase')
+      return [{ type: 'nexusEmperorSellerPurchase', event: d.event,
+        use: !!g.nexusEmperorSellerPurchase?.canUse && !g.nexusEmperorSellerPurchase.blocked }];
     if (d.kind === 'nexusFremenCunningOffer')
       return [{ type: 'decision', event: d.event,
         accept: g.nexusCards?.card === 'fremen' && me.faction === 'fremen' &&