Enable Advanced classic group preview

game/engine.ts

@@ -1448,7 +1448,7 @@ type RicheseAllyOffer = {
   payer: string;
 };
 export type Game = {
-  /** Explicit incomplete Basic group preview; absent in legacy games. */
+  /** Explicit incomplete classic group preview; absent in legacy games. */
   coalitionPreview?: 'three' | 'three-short' | 'unlimited';
   /** Group-alliance integration state; absent in ordinary existing games. */
   coalitionState?: CoalitionState;
@@ -10886,11 +10886,11 @@ function startModules(state: Game): Game {
 /** Public consistency only; each module's genuine initializer validates its own envelope. */
 function baseStartProfileBlock(g: Game): string | null {
   if (g.coalitionPreview && g.status === 'lobby' &&
-      (g.advanced || g.expansions.length > 0 || g.players.length < 3 ||
+      (g.expansions.length > 0 || g.players.length < 3 ||
        !g.players.every(p => CLASSIC_FACTIONS[p.faction] === true) || g.twoPlayerControllers ||
        g.shortAllianceVictory || g.techTokens || g.strongholdCards || g.homeworlds ||
        g.nexusCards || g.discoveryEnabled || g.leaderSkills || g.ecazTreachery || lobbyModulesSelected(g)))
-    return 'The group-alliance preview needs at least three classic factions, Basic rules, and no expansion decks, other optional modules, two-person setup or separate short-alliance setting.';
+    return 'The group-alliance preview needs at least three classic factions and no expansion decks, other optional modules, two-person setup or separate short-alliance setting.';
   if (g.status === 'lobby' && (g.moritaniAssassinatePreview || g.moritaniAssassinate))
     return 'Separate development profiles cannot be enabled by a normal start.';
   if (g.status === 'lobby' && (g.leaderSkills || g.ecazTreachery))