Extend Basic Emperor auction gifts to Nexus and Richese

tests/fixture-nexus-emperor-payment.ts

@@ -65,6 +65,10 @@ export function stepNexusEmperorPayment(game: Game, step: NexusEmperorPaymentSte
   return scalarEntropy(() => applyAction(game, step.actor, step.action));
 }
 export function nextNexusEmperorPaymentStep(game: Game): NexusEmperorPaymentStep {
+  if (!game.response && game.pendingEmperorAuctionGift) {
+    const pending = game.pendingEmperorAuctionGift;
+    return { actor: pending.owner, action: { type: 'emperorAuctionGiftContinue', event: pending.event } };
+  }
   if (clean(game) && game.nexusCards?.phase?.stage === 'drawing') {
     const actor = game.nexusCards.phase.eligible.find(id => !game.nexusCards!.phase!.done.includes(id));
     assert.ok(actor);