Expose sortie plan readiness

src/game/scenes/CampScene.ts

@@ -299,6 +299,7 @@ type SortiePlanSummary = {
   formationSlots: SortieFormationSlot[];
   warningLine: string;
   warningCount: number;
+  ready: boolean;
   warnings: string[];
 };
 
@@ -13461,6 +13462,7 @@ export class CampScene extends Phaser.Scene {
       formationSlots,
       warningLine: warnings[0] ?? (hasBattle ? '배치 균형 양호' : '동행 균형 양호'),
       warningCount: warnings.length,
+      ready: warnings.length === 0,
       warnings
     };
   }