diff --git a/app/game-engine/src/index.ts b/app/game-engine/src/index.ts
index cb0ff5c..4e5a570 100644
--- a/app/game-engine/src/index.ts
+++ b/app/game-engine/src/index.ts
@@ -1 +1,5 @@
-export {};
+export * from './lifecycle/types.js';
+export * from './lifecycle/clock.js';
+export * from './lifecycle/inMemoryControlQueue.js';
+export * from './lifecycle/turnSchedule.js';
+export * from './lifecycle/turnDaemonLifecycle.js';
diff --git a/app/game-engine/src/lifecycle/clock.ts b/app/game-engine/src/lifecycle/clock.ts
new file mode 100644
index 0000000..02d4395
--- /dev/null
+++ b/app/game-engine/src/lifecycle/clock.ts
@@ -0,0 +1,15 @@
+import type { Clock } from './types.js';
+
+export class SystemClock implements Clock {
+    // 시스템 시간을 기준으로 동작하는 기본 시계.
+    nowMs(): number {
+        return Date.now();
+    }
+
+    async sleepMs(ms: number): Promise<void> {
+        if (ms <= 0) {
+            return;
+        }
+        await new Promise((resolve) => setTimeout(resolve, ms));
+    }
+}
diff --git a/app/game-engine/src/lifecycle/inMemoryControlQueue.ts b/app/game-engine/src/lifecycle/inMemoryControlQueue.ts
new file mode 100644
index 0000000..67478ee
--- /dev/null
+++ b/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);
+        }
+    }
+}
diff --git a/app/game-engine/src/lifecycle/turnDaemonLifecycle.ts b/app/game-engine/src/lifecycle/turnDaemonLifecycle.ts
new file mode 100644
index 0000000..8b2ded2
--- /dev/null
+++ b/app/game-engine/src/lifecycle/turnDaemonLifecycle.ts
@@ -0,0 +1,234 @@
+import type {
+    RunReason,
+    TurnDaemonCommand,
+    TurnDaemonControlQueue,
+    TurnDaemonHooks,
+    TurnDaemonStatus,
+    TurnRunBudget,
+    TurnRunResult,
+    TurnSchedule,
+    TurnStateStore,
+    TurnProcessor,
+    Clock,
+    TurnCheckpoint,
+} from './types.js';
+
+type PendingRun = {
+    reason: RunReason;
+    targetTime?: Date;
+    budget?: TurnRunBudget;
+};
+
+export interface TurnDaemonLifecycleOptions {
+    profile: string;
+    defaultBudget: TurnRunBudget;
+}
+
+export interface TurnDaemonLifecycleDeps {
+    clock: Clock;
+    controlQueue: TurnDaemonControlQueue;
+    schedule: TurnSchedule;
+    stateStore: TurnStateStore;
+    processor: TurnProcessor;
+    hooks?: TurnDaemonHooks;
+}
+
+export class TurnDaemonLifecycle {
+    // 턴 데몬의 생명주기를 관리하는 루프.
+    private readonly clock: Clock;
+    private readonly controlQueue: TurnDaemonControlQueue;
+    private readonly schedule: TurnSchedule;
+    private readonly stateStore: TurnStateStore;
+    private readonly processor: TurnProcessor;
+    private readonly hooks?: TurnDaemonHooks;
+    private readonly options: TurnDaemonLifecycleOptions;
+
+    private status: TurnDaemonStatus;
+    private pendingRun: PendingRun | null = null;
+    private stopping = false;
+    private loopPromise: Promise<void> | null = null;
+
+    constructor(deps: TurnDaemonLifecycleDeps, options: TurnDaemonLifecycleOptions) {
+        this.clock = deps.clock;
+        this.controlQueue = deps.controlQueue;
+        this.schedule = deps.schedule;
+        this.stateStore = deps.stateStore;
+        this.processor = deps.processor;
+        this.hooks = deps.hooks;
+        this.options = options;
+        this.status = {
+            state: 'idle',
+            running: false,
+            paused: false,
+            queueDepth: 0,
+        };
+    }
+
+    start(): Promise<void> {
+        if (!this.loopPromise) {
+            this.loopPromise = this.runLoop();
+        }
+        return this.loopPromise;
+    }
+
+    async stop(reason?: string): Promise<void> {
+        this.controlQueue.enqueue({ type: 'shutdown', reason });
+        if (this.loopPromise) {
+            await this.loopPromise;
+        }
+    }
+
+    requestRun(reason: RunReason, targetTime?: Date, budget?: TurnRunBudget): void {
+        this.controlQueue.enqueue({
+            type: 'run',
+            reason,
+            targetTime: targetTime ? targetTime.toISOString() : undefined,
+            budget,
+        });
+    }
+
+    pause(reason?: string): void {
+        this.controlQueue.enqueue({ type: 'pause', reason });
+    }
+
+    resume(reason?: string): void {
+        this.controlQueue.enqueue({ type: 'resume', reason });
+    }
+
+    getStatus(): TurnDaemonStatus {
+        return {
+            ...this.status,
+            queueDepth: this.controlQueue.getDepth(),
+        };
+    }
+
+    private async runLoop(): Promise<void> {
+        await this.initializeState();
+        while (!this.stopping) {
+            await this.drainCommands();
+            if (this.stopping) {
+                break;
+            }
+            if (this.status.paused) {
+                await this.waitForResume();
+                continue;
+            }
+
+            if (this.pendingRun) {
+                await this.runOnce(this.pendingRun);
+                this.pendingRun = null;
+                continue;
+            }
+
+            const nextTurnTime = this.getNextTurnTime();
+            if (!nextTurnTime) {
+                await this.clock.sleepMs(200);
+                continue;
+            }
+
+            const nowMs = this.clock.nowMs();
+            const nextTurnMs = nextTurnTime.getTime();
+            if (nowMs >= nextTurnMs) {
+                await this.runOnce({ reason: 'schedule', targetTime: nextTurnTime });
+                continue;
+            }
+
+            const command = await this.controlQueue.waitUntil(nextTurnMs);
+            if (command) {
+                await this.handleCommand(command);
+            }
+        }
+    }
+
+    private async initializeState(): Promise<void> {
+        const lastTurnTime = await this.stateStore.loadLastTurnTime();
+        const checkpoint = await this.stateStore.loadCheckpoint();
+        this.status.lastTurnTime = lastTurnTime.toISOString();
+        this.status.checkpoint = checkpoint;
+        this.status.nextTurnTime = this.schedule.getNextTurnTime(lastTurnTime).toISOString();
+    }
+
+    private getNextTurnTime(): Date | null {
+        if (!this.status.lastTurnTime) {
+            return null;
+        }
+        return this.schedule.getNextTurnTime(new Date(this.status.lastTurnTime));
+    }
+
+    private async drainCommands(): Promise<void> {
+        const commands = await this.controlQueue.drain();
+        for (const command of commands) {
+            await this.handleCommand(command);
+            if (this.stopping) {
+                return;
+            }
+        }
+    }
+
+    private async waitForResume(): Promise<void> {
+        const command = await this.controlQueue.waitUntil(null);
+        if (command) {
+            await this.handleCommand(command);
+        }
+    }
+
+    private async handleCommand(command: TurnDaemonCommand): Promise<void> {
+        switch (command.type) {
+            case 'pause':
+                this.status.paused = true;
+                this.status.state = 'paused';
+                return;
+            case 'resume':
+                this.status.paused = false;
+                this.status.state = 'idle';
+                return;
+            case 'shutdown':
+                this.status.state = 'stopping';
+                this.stopping = true;
+                return;
+            case 'run':
+                this.pendingRun = {
+                    reason: command.reason,
+                    targetTime: command.targetTime ? new Date(command.targetTime) : undefined,
+                    budget: command.budget,
+                };
+                this.status.pendingReason = command.reason;
+                return;
+        }
+    }
+
+    private async runOnce(pending: PendingRun): Promise<void> {
+        const startMs = this.clock.nowMs();
+        this.status.state = 'running';
+        this.status.running = true;
+        this.status.pendingReason = pending.reason;
+
+        const targetTime = pending.targetTime ?? new Date(startMs);
+        const budget = pending.budget ?? this.options.defaultBudget;
+        const checkpoint = this.status.checkpoint;
+        let result: TurnRunResult;
+
+        try {
+            result = await this.processor.run(targetTime, budget, checkpoint);
+        } finally {
+            this.status.running = false;
+        }
+
+        this.status.state = 'flushing';
+        await this.stateStore.saveLastTurnTime(new Date(result.lastTurnTime));
+        await this.stateStore.saveCheckpoint(result.checkpoint);
+        await this.hooks?.flushChanges?.(result);
+        await this.hooks?.publishEvents?.(result);
+        this.applyRunResult(result, startMs);
+        this.status.state = 'idle';
+    }
+
+    private applyRunResult(result: TurnRunResult, startMs: number): void {
+        this.status.lastRunAt = new Date(startMs).toISOString();
+        this.status.lastDurationMs = Math.max(0, this.clock.nowMs() - startMs);
+        this.status.lastTurnTime = result.lastTurnTime;
+        this.status.checkpoint = result.checkpoint;
+        const nextTurnTime = this.schedule.getNextTurnTime(new Date(result.lastTurnTime));
+        this.status.nextTurnTime = nextTurnTime.toISOString();
+    }
+}
diff --git a/app/game-engine/src/lifecycle/turnSchedule.ts b/app/game-engine/src/lifecycle/turnSchedule.ts
new file mode 100644
index 0000000..22bb863
--- /dev/null
+++ b/app/game-engine/src/lifecycle/turnSchedule.ts
@@ -0,0 +1,17 @@
+import type { TurnSchedule } from './types.js';
+
+export class FixedIntervalSchedule implements TurnSchedule {
+    // 일정 간격으로 턴을 진행하는 스케줄러.
+    private intervalMs: number;
+
+    constructor(intervalMs: number) {
+        if (intervalMs <= 0) {
+            throw new Error('intervalMs must be positive');
+        }
+        this.intervalMs = intervalMs;
+    }
+
+    getNextTurnTime(lastTurnTime: Date): Date {
+        return new Date(lastTurnTime.getTime() + this.intervalMs);
+    }
+}
diff --git a/app/game-engine/src/lifecycle/types.ts b/app/game-engine/src/lifecycle/types.ts
new file mode 100644
index 0000000..1f6b91c
--- /dev/null
+++ b/app/game-engine/src/lifecycle/types.ts
@@ -0,0 +1,76 @@
+export type TurnDaemonState = 'idle' | 'running' | 'flushing' | 'paused' | 'stopping';
+
+export type RunReason = 'schedule' | 'manual' | 'poke';
+
+export interface TurnRunBudget {
+    budgetMs: number;
+    maxGenerals: number;
+    catchUpCap: number;
+}
+
+export interface TurnCheckpoint {
+    turnTime: string;
+    generalId?: number;
+    year: number;
+    month: number;
+}
+
+export interface TurnRunResult {
+    lastTurnTime: string;
+    processedGenerals: number;
+    processedTurns: number;
+    durationMs: number;
+    partial: boolean;
+    checkpoint?: TurnCheckpoint;
+}
+
+export interface TurnDaemonStatus {
+    state: TurnDaemonState;
+    running: boolean;
+    paused: boolean;
+    lastRunAt?: string;
+    lastDurationMs?: number;
+    lastTurnTime?: string;
+    nextTurnTime?: string;
+    pendingReason?: RunReason;
+    queueDepth: number;
+    checkpoint?: TurnCheckpoint;
+}
+
+export type TurnDaemonCommand =
+    | { type: 'run'; reason: RunReason; targetTime?: string; budget?: TurnRunBudget }
+    | { type: 'pause'; reason?: string }
+    | { type: 'resume'; reason?: string }
+    | { type: 'shutdown'; reason?: string };
+
+export interface Clock {
+    nowMs(): number;
+    sleepMs(ms: number): Promise<void>;
+}
+
+export interface TurnSchedule {
+    getNextTurnTime(lastTurnTime: Date): Date;
+}
+
+export interface TurnProcessor {
+    run(targetTime: Date, budget: TurnRunBudget, checkpoint?: TurnCheckpoint): Promise<TurnRunResult>;
+}
+
+export interface TurnStateStore {
+    loadLastTurnTime(): Promise<Date>;
+    saveLastTurnTime(turnTime: Date): Promise<void>;
+    loadCheckpoint(): Promise<TurnCheckpoint | undefined>;
+    saveCheckpoint(checkpoint?: TurnCheckpoint): Promise<void>;
+}
+
+export interface TurnDaemonControlQueue {
+    enqueue(command: TurnDaemonCommand): void;
+    drain(): Promise<TurnDaemonCommand[]>;
+    waitUntil(deadlineMs: number | null): Promise<TurnDaemonCommand | null>;
+    getDepth(): number;
+}
+
+export interface TurnDaemonHooks {
+    flushChanges?(result: TurnRunResult): Promise<void>;
+    publishEvents?(result: TurnRunResult): Promise<void>;
+}