fix: prefix unused variables with underscore to fix lint errors

src/engine/systems/ai/AITacticsManager.ts

@@ -53,7 +53,7 @@ const HUNT_MODE_STUCK_DISENGAGE_TICKS = 300; // ~15 seconds with no combat → f
 // Air control constants
 const AIR_HARASS_MAX_UNITS = 3; // Max air units for harassment
 const AIR_FLANK_OFFSET = 20; // How far air units flank from the main army's attack vector
-const AIR_REGROUP_DISTANCE = 30; // Distance from base to regroup air units
+const _AIR_REGROUP_DISTANCE = 30; // Distance from base to regroup air units
 const AIR_COMMAND_INTERVAL = 30; // Re-command air units every 30 ticks (~1.5 sec)
 const SUPPORT_FOLLOW_DISTANCE = 12; // Support units stay this far behind army center
 
@@ -1766,10 +1766,7 @@ export class AITacticsManager {
    * Command support air units (Lifter, Overseer) to follow the main army.
    * Support units shadow the army centroid, staying slightly behind.
    */
-  private commandSupportAir(
-    ai: AIPlayer,
-    currentTick: number
-  ): void {
+  private commandSupportAir(ai: AIPlayer, currentTick: number): void {
     const supportUnits = this.getSupportAirUnits(ai.playerId);
     if (supportUnits.length === 0) return;
 

tests/engine/systems/AIMicroSystem.test.ts

@@ -1601,10 +1601,10 @@ describe('AIMicroSystem', () => {
       isDead: boolean;
     }
 
-    function getSupportAirUnits(units: MockSupportUnit[], playerId: string): number[] {
+    function getSupportAirUnits(units: MockSupportUnit[], _playerId: string): number[] {
       return units
-        .filter(u => !u.isDead && u.isFlying && !u.isWorker && u.attackDamage === 0)
-        .map(u => u.id);
+        .filter((u) => !u.isDead && u.isFlying && !u.isWorker && u.attackDamage === 0)
+        .map((u) => u.id);
     }
 
     it('should return Lifter-type units (flying, no attack)', () => {
@@ -1644,10 +1644,7 @@ describe('AIMicroSystem', () => {
       state: string;
     }
 
-    function getScoutUnit(
-      units: MockScoutUnit[],
-      preferredTypes: Set<string>
-    ): number | null {
+    function getScoutUnit(units: MockScoutUnit[], preferredTypes: Set<string>): number | null {
       // First: idle flying units
       for (const u of units) {
         if (u.isFlying && !u.isWorker && u.state === 'idle') return u.id;