Tune early objective route balance

src/game/scenes/BattleScene.ts

@@ -2915,6 +2915,7 @@ const defaultEnemyAiByClass: Partial<Record<UnitClassKey, EnemyAiBehavior>> = {
   rebelLeader: 'guard'
 };
 
+const earlyObjectiveAnchorLeaderIds = new Set(['rebel-leader', 'guangzong-leader-ma-yuan']);
 const guardDetectionRange = 5;
 let leaderUnitId = battleScenario.leaderUnitId;
 let quickVictoryTurnLimit = battleScenario.quickVictoryTurnLimit;
@@ -11794,6 +11795,9 @@ export class BattleScene extends Phaser.Scene {
   }
 
   private enemyBehavior(enemy: UnitData): EnemyAiBehavior {
+    if (earlyObjectiveAnchorLeaderIds.has(enemy.id)) {
+      return 'hold';
+    }
     const lateNorthernPrefixes = [
       'northern-fourth',
       'northern-fifth',