Double Pulse tower costs and fix enemy count for swarm splits

Pulse Cannon was too strong for its price -- doubled baseCost (85->170)
and upgradeCosts ([127,170]->[254,340]).

Swarm Cluster splitting into mini_drones now increases totalEnemies so
the HUD counter stays accurate instead of hitting 0 prematurely.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: thagler

src/config/towers.ts

@@ -84,8 +84,8 @@ export const TOWERS: Record<string, TowerConfig> = {
     key: 'pulse',
     name: 'Pulse Cannon',
     description: 'Shockwave emitter. Hits all enemies in radius.',
-    baseCost: 85,
-    upgradeCosts: [127, 170],
+    baseCost: 170,
+    upgradeCosts: [254, 340],
     sellRefundRate: 0.5,
     projectileSpeed: 0, // area effect
     color: '#cc44ff',

src/scenes/GameScene.ts

@@ -229,6 +229,11 @@ export class GameScene extends Phaser.Scene {
       }
     });
 
+    // ---- Swarm split: adjust total enemy count for spawned children ----
+    this.enemySpawner.on('enemies-spawned-from-split', (data: { count: number }) => {
+      this.totalEnemies += data.count;
+    });
+
     // ---- Enemy reached base: lose a life + visual effects ----
     this.enemySpawner.on('enemy-reached-base', (data: { enemy: Enemy }) => {
       this.lives--;

src/systems/EnemySpawner.ts

@@ -228,6 +228,7 @@ export class EnemySpawner extends Phaser.Events.EventEmitter {
       waypointIndex: number;
     }) => {
       this.handleSplit(data);
+      this.emit('enemies-spawned-from-split', { count: data.splitCount });
     });
 
     this.enemyGroup.add(enemy);