Exercise combined expansion Nexus games and saved continuation

game/engine.ts

@@ -6716,6 +6716,22 @@ export function initializePairedNexusGameForAudit(state: Game): Game {
   return initializeSetupGameForAudit(state, false, true, false, false, false, false, true);
 }
 
+/** Offline-only all-expansion Nexus composition; not a public start gate. */
+export function initializeCombinedNexusGameForAudit(state: Game): Game {
+  requireRule(state.expansions.length === 3 &&
+    ['ix', 'choam', 'ecaz'].every(expansion => state.expansions.includes(expansion)) &&
+    [5, 6].includes(state.players.length) &&
+    state.players.every(player => ['ixians', 'tleilaxu', 'choam', 'richese', 'ecaz', 'moritani'].includes(player.faction)) &&
+    ['ixians', 'tleilaxu', 'choam', 'ecaz', 'moritani']
+      .every(faction => state.players.some(player => player.faction === faction)),
+    'The combined Nexus sample requires five or six expansion factions and their three decks.');
+  requireRule(!!state.nexusCards && state.nexusCards.cards === null && state.nexusCards.phase === null &&
+    !state.homeworlds && !state.leaderSkills && !state.discoveryEnabled &&
+    !state.ecazTreachery && !state.techTokens && !state.strongholdCards,
+    'Enable only Nexus Cards in a fresh combined expansion lobby.');
+  return initializeSetupGameForAudit(state, false, true, false, false, false, false, true);
+}
+
 /** Offline prototype entry through real Ix setup, including both expansion factions.
  * No player action or room API bypasses the normal release gates. */
 export function initializeIxGameForAudit(state: Game): Game {