feat: 게임 엔진 생명주기 및 스케줄링 관련 클래스 추가

app/game-engine/src/lifecycle/inMemoryControlQueue.ts

@@ -0,0 +1,62 @@
+import type { TurnDaemonCommand, TurnDaemonControlQueue } from './types.js';
+
+type Waiter = {
+    deadlineMs: number | null;
+    resolve: (command: TurnDaemonCommand | null) => void;
+    timeoutId?: ReturnType<typeof setTimeout>;
+};
+
+export class InMemoryControlQueue implements TurnDaemonControlQueue {
+    // 단일 프로세스 내에서 쓰는 간단한 제어 큐.
+    private queue: TurnDaemonCommand[] = [];
+    private waiters: Waiter[] = [];
+
+    enqueue(command: TurnDaemonCommand): void {
+        const waiter = this.waiters.shift();
+        if (waiter) {
+            if (waiter.timeoutId) {
+                clearTimeout(waiter.timeoutId);
+            }
+            waiter.resolve(command);
+            return;
+        }
+        this.queue.push(command);
+    }
+
+    async drain(): Promise<TurnDaemonCommand[]> {
+        if (this.queue.length === 0) {
+            return [];
+        }
+        const drained = this.queue.slice();
+        this.queue.length = 0;
+        return drained;
+    }
+
+    async waitUntil(deadlineMs: number | null): Promise<TurnDaemonCommand | null> {
+        if (this.queue.length > 0) {
+            return this.queue.shift() ?? null;
+        }
+        return new Promise((resolve) => {
+            const waiter: Waiter = { deadlineMs, resolve };
+            if (deadlineMs !== null) {
+                const delay = Math.max(0, deadlineMs - Date.now());
+                waiter.timeoutId = setTimeout(() => {
+                    this.removeWaiter(waiter);
+                    resolve(null);
+                }, delay);
+            }
+            this.waiters.push(waiter);
+        });
+    }
+
+    getDepth(): number {
+        return this.queue.length;
+    }
+
+    private removeWaiter(waiter: Waiter): void {
+        const index = this.waiters.indexOf(waiter);
+        if (index >= 0) {
+            this.waiters.splice(index, 1);
+        }
+    }
+}