Enable early native-faction Truthtrance promises

game/native-promise-scope.ts

@@ -0,0 +1,31 @@
+import { FACTIONS } from './catalog';
+
+export type NativePromiseScope = {
+  advanced: boolean;
+  expansions: readonly unknown[];
+  players: readonly { faction: string }[];
+  homeworlds?: unknown;
+  nexusCards?: unknown;
+  leaderSkills?: unknown;
+  techTokens?: unknown;
+  strongholdCards?: unknown;
+  discoveryEnabled?: unknown;
+  discoveries?: unknown;
+  discoveryStash?: unknown;
+  greatMaker?: unknown;
+  ecazTreachery?: unknown;
+};
+
+/** Registered native factions with their selected decks. Optional modules
+ * keep their separate promise envelopes; this never opens a game-start gate. */
+export function nativePromiseScopeSupported(g: NativePromiseScope): boolean {
+  return typeof g.advanced === 'boolean' && g.players.length >= 2 && g.players.length <= 6 &&
+    g.expansions.every(id => typeof id === 'string' && ['ix','choam','ecaz'].includes(id)) &&
+    new Set(g.expansions).size === g.expansions.length &&
+    g.players.every(p => {
+      const family = FACTIONS.find(f => f.id === p.faction)?.expansion;
+      return family === 'base' || !!family && g.expansions.includes(family);
+    }) && !g.homeworlds && !g.nexusCards && !g.leaderSkills && !g.techTokens &&
+    !g.strongholdCards && !g.discoveryEnabled && !g.discoveries && !g.discoveryStash &&
+    !g.greatMaker && !g.ecazTreachery;
+}