Adopt authorized Advanced Storm and alliance separation defaults

game/allied-separation.ts

@@ -0,0 +1,50 @@
+export type AlliedSeparationQuoteContext = Readonly<{
+  advanced: boolean;
+  turn: number;
+  player: string;
+  ally: string | null;
+  playerAllySinceTurn?: number;
+  allySinceTurn?: number;
+  remaining: readonly string[];
+  territories: readonly Readonly<{
+    territory: string;
+    polar: boolean;
+    ownPresent: boolean;
+    allyPresent: boolean;
+    ownAdvisors: boolean;
+    allyAdvisors: boolean;
+    ecazCoexist: boolean;
+  }>[];
+}>;
+
+/**
+ * Quote the ending player's loss territories, not casualties or force custody.
+ * The engine supplies canonical presence, advisor stance and Ecaz coexistence.
+ * Advanced separates at every player's end; Basic retains its legacy timing.
+ */
+export function quoteAlliedSeparation(
+  context: AlliedSeparationQuoteContext,
+): string[] {
+  if (!context.ally) return [];
+  if (
+    !context.advanced &&
+    (context.remaining.includes(context.ally) ||
+      (context.playerAllySinceTurn === context.turn &&
+        context.allySinceTurn === context.turn))
+  )
+    return [];
+
+  const territories: string[] = [];
+  for (const group of context.territories) {
+    if (
+      group.polar ||
+      !group.ownPresent ||
+      !group.allyPresent ||
+      group.ecazCoexist ||
+      (context.advanced && (group.ownAdvisors || group.allyAdvisors))
+    )
+      continue;
+    territories.push(group.territory);
+  }
+  return territories;
+}