diff --git a/cocoscreator_projects/YouleNexus/assets/framework/platform/runtime.ts b/cocoscreator_projects/YouleNexus/assets/framework/platform/runtime.ts
index 169fd7a..a73995c 100644
--- a/cocoscreator_projects/YouleNexus/assets/framework/platform/runtime.ts
+++ b/cocoscreator_projects/YouleNexus/assets/framework/platform/runtime.ts
@@ -119,6 +119,8 @@ export class PlatformRuntime {
   private fatalError: Error | null = null;
   private wireStopped = false;
   private startupGeneration = 0;
+  private readonly stateObservers = new Set<() => void>();
+  private observerDispatchError: Error | null = null;
 
   constructor(private readonly options: PlatformRuntimeOptions) {
     this.clock = options.clock ?? realClock;
@@ -132,6 +134,54 @@ export class PlatformRuntime {
     return this.gate.ready;
   }
 
+  subscribeState(
+    listener: (state: PlatformState) => void,
+    onError: (error: unknown) => void,
+  ): () => void {
+    if (
+      this.lifecycle === 'kicked'
+      || this.lifecycle === 'fatal'
+      || this.lifecycle === 'stopped'
+    ) {
+      throw new Error(`PlatformRuntime cannot subscribe while ${this.lifecycle}`);
+    }
+
+    let active = true;
+    const unsubscribeStore = this.store.subscribe((state) => {
+      if (!active) return;
+      try {
+        listener(state);
+      } catch (error) {
+        off();
+        try {
+          onError(error);
+        } catch (callbackError) {
+          const failure = this.failureError(
+            'UI observer',
+            error,
+            [callbackError],
+          );
+          if (this.isStopped()) {
+            this.observerDispatchError = failure;
+          } else {
+            this.showFatalOnce(failure);
+          }
+        }
+      }
+    });
+    const off = (): void => {
+      if (!active) return;
+      active = false;
+      try {
+        unsubscribeStore();
+      } finally {
+        this.stateObservers.delete(off);
+      }
+    };
+    this.stateObservers.add(off);
+    return off;
+  }
+
   async start(): Promise<void> {
     if (this.lifecycle !== 'idle') {
       throw new Error(`PlatformRuntime cannot start while ${this.lifecycle}`);
@@ -260,6 +310,9 @@ export class PlatformRuntime {
     this.wireIsOpen = false;
 
     const errors: unknown[] = [];
+    for (const off of [...this.stateObservers]) {
+      this.captureCleanupError(errors, off);
+    }
     this.captureCleanupError(errors, () => { this.clearLoginGuard(); });
     const unsubscribe = this.unsubscribeWire;
     this.unsubscribeWire = null;
@@ -324,6 +377,7 @@ export class PlatformRuntime {
         case 'open':
           this.wireIsOpen = true;
           this.store.setConnectionPhase('connected');
+          this.throwObserverDispatchError();
           this.markReady('socket');
           if (this.connectionIntent.type === 'switch') {
             const loginEnvelope = this.loginEnvelope;
@@ -341,8 +395,10 @@ export class PlatformRuntime {
             this.clearLoginGuard();
           }
           const stateBeforeDispatch = this.store.getState();
+          const dispatchResult = this.requireRouter().dispatch(event.message);
+          this.throwObserverDispatchError();
           if (
-            this.requireRouter().dispatch(event.message) === 'handled-platform'
+            dispatchResult === 'handled-platform'
             && this.lifecycle === 'running'
             && this.store.getState() !== stateBeforeDispatch
           ) {
@@ -353,6 +409,8 @@ export class PlatformRuntime {
         case 'reconnecting':
           this.wireIsOpen = false;
           this.store.setConnectionPhase(event.type);
+          this.throwObserverDispatchError();
+          if (this.isTerminal()) return;
           this.options.scene.showReconnect();
           break;
         case 'close':
@@ -360,10 +418,11 @@ export class PlatformRuntime {
           break;
       }
     } catch (error) {
+      const failure = this.withObserverDispatchError(error);
       // A lifecycle callback may stop and then throw. Preserve that error without
       // replacing the requested terminal stop with a fatal lifecycle transition.
-      if (this.isStopped()) throw error;
-      this.showFatalOnce(error);
+      if (this.isStopped()) throw failure;
+      this.showFatalOnce(failure);
     }
   }
 
@@ -371,6 +430,31 @@ export class PlatformRuntime {
     return this.lifecycle === 'stopped';
   }
 
+  private isTerminal(): boolean {
+    return this.lifecycle === 'fatal'
+      || this.lifecycle === 'kicked'
+      || this.lifecycle === 'stopped';
+  }
+
+  private throwObserverDispatchError(): void {
+    const failure = this.takeObserverDispatchError();
+    if (failure === null) return;
+    throw failure;
+  }
+
+  private takeObserverDispatchError(): Error | null {
+    const failure = this.observerDispatchError;
+    this.observerDispatchError = null;
+    return failure;
+  }
+
+  private withObserverDispatchError(error: unknown): unknown {
+    const observerFailure = this.takeObserverDispatchError();
+    return observerFailure === null
+      ? error
+      : this.failureError('UI observer dispatch', observerFailure, [error]);
+  }
+
   private sendLoginEnvelope(envelope: OutboundEnvelope): void {
     const wire = this.requireOpenWire();
     const session = this.requireSession();
@@ -441,6 +525,9 @@ export class PlatformRuntime {
     this.connectionIntent = { type: 'none' };
     this.wireIsOpen = false;
     const errors: unknown[] = [];
+    for (const off of [...this.stateObservers]) {
+      this.captureCleanupError(errors, off);
+    }
     this.captureCleanupError(errors, () => { this.store.setConnectionPhase('kicked'); });
     this.captureCleanupError(errors, () => { this.clearLoginGuard(); });
     this.captureCleanupError(errors, () => { this.options.scene.showKicked(data); });
@@ -603,6 +690,9 @@ export class PlatformRuntime {
     this.wireIsOpen = false;
 
     const cleanupErrors: unknown[] = [];
+    for (const off of [...this.stateObservers]) {
+      this.captureCleanupError(cleanupErrors, off);
+    }
     this.captureCleanupError(cleanupErrors, () => { this.clearLoginGuard(); });
 
     const unsubscribe = this.unsubscribeWire;
diff --git a/cocoscreator_projects/framework-tests/platform/runtime.test.ts b/cocoscreator_projects/framework-tests/platform/runtime.test.ts
index 9b2fb99..cfc56dc 100644
--- a/cocoscreator_projects/framework-tests/platform/runtime.test.ts
+++ b/cocoscreator_projects/framework-tests/platform/runtime.test.ts
@@ -304,6 +304,332 @@ function makeRuntime(config: RuntimeConfig = runtimeConfig(), entry = makeGameEn
   return { runtime, wire, scene, clock, factoryConfigs, config };
 }
 
+test('UI observes canonical commits and unsubscribe is idempotent', async () => {
+  const { runtime, wire } = makeRuntime();
+  const seen: unknown[] = [];
+  const off = runtime.subscribeState(
+    state => { seen.push(state); },
+    error => { throw error; },
+  );
+  assert.equal(seen.length, 0);
+  await runtime.start();
+  wire.emit({ type: 'open', server: 'ws://agent' });
+  assert.equal(seen[seen.length - 1], runtime.state);
+  off();
+  off();
+  const count = seen.length;
+  runtime.login(ACCOUNT);
+  wire.emit({ type: 'message', message: {
+    route: 'agent', rpc: 'player_login', data: fixture('player-login-success.json'),
+  } });
+  assert.equal(seen.length, count);
+  runtime.stop();
+  assert.throws(() => runtime.subscribeState(() => {}, () => {}), /stopped/);
+});
+
+test('a failing UI observer reports its original error once while other observers continue', async () => {
+  const { runtime, wire } = makeRuntime();
+  const failure = { source: 'render' };
+  const reported: unknown[] = [];
+  let failingCalls = 0;
+  const healthyStates: unknown[] = [];
+  runtime.subscribeState(
+    () => {
+      failingCalls += 1;
+      throw failure;
+    },
+    error => { reported.push(error); },
+  );
+  runtime.subscribeState(
+    state => { healthyStates.push(state); },
+    error => { throw error; },
+  );
+
+  await runtime.start();
+  wire.emit({ type: 'open', server: 'ws://agent' });
+
+  assert.equal(failingCalls, 1);
+  assert.deepEqual(reported, [failure]);
+  assert.equal(reported[0], failure);
+  assert.equal(healthyStates[0], runtime.state);
+
+  runtime.login(ACCOUNT);
+  wire.emit({ type: 'message', message: {
+    route: 'agent', rpc: 'player_login', data: fixture('player-login-success.json'),
+  } });
+  assert.equal(failingCalls, 1);
+  assert.equal(healthyStates[healthyStates.length - 1], runtime.state);
+  runtime.stop();
+});
+
+test('an onError failure enters fatal with both UI error identities and cancels observers', async () => {
+  const { runtime, wire, scene } = makeRuntime();
+  const listenerFailure = { source: 'listener' };
+  const onErrorFailure = { source: 'onError' };
+  let laterObserverCalls = 0;
+  runtime.subscribeState(
+    () => { throw listenerFailure; },
+    () => { throw onErrorFailure; },
+  );
+  runtime.subscribeState(
+    () => { laterObserverCalls += 1; },
+    error => { throw error; },
+  );
+  await runtime.start();
+
+  wire.emit({ type: 'open', server: 'ws://agent' });
+
+  assert.equal(laterObserverCalls, 0);
+  assert.equal(wire.stopCalls, 1);
+  const fatal = scene.calls.find(call => call.name === 'fatal')?.value;
+  assert.ok(fatal instanceof Error);
+  const errors = (fatal as Error & { readonly errors: readonly unknown[] }).errors;
+  assert.equal(errors.length, 2);
+  assert.equal(errors[0], listenerFailure);
+  assert.equal(errors[1], onErrorFailure);
+  assert.throws(() => runtime.subscribeState(() => {}, () => {}), /fatal/);
+});
+
+for (const terminal of ['stop', 'fatal', 'kick'] as const) {
+  test(`${terminal} invalidates a late Store delivery and rejects new UI observers`, async () => {
+    const originalSubscribe = PlatformStore.prototype.subscribe;
+    let retainedListener: Parameters<PlatformStore['subscribe']>[0] | null = null;
+    PlatformStore.prototype.subscribe = function retainFirstListener(listener) {
+      retainedListener ??= listener;
+      return originalSubscribe.call(this, listener);
+    };
+
+    try {
+      const setup = makeRuntime();
+      let calls = 0;
+      setup.runtime.subscribeState(
+        () => { calls += 1; },
+        error => { throw error; },
+      );
+      await setup.runtime.start();
+      setup.wire.emit({ type: 'open', server: 'ws://agent' });
+      const callsBeforeTermination = calls;
+      setup.wire.onAction = (name) => {
+        if (name !== 'stop') return;
+        const listener = retainedListener;
+        assert.ok(listener);
+        listener(setup.runtime.state, setup.runtime.state);
+      };
+
+      if (terminal === 'stop') {
+        setup.runtime.stop();
+      } else if (terminal === 'fatal') {
+        setup.scene.onCall = (name) => {
+          if (name === 'reconnect') throw new Error('reconnect render failed');
+        };
+        setup.wire.emit({ type: 'slow' });
+      } else {
+        setup.runtime.login(ACCOUNT);
+        setup.wire.emit({ type: 'message', message: {
+          route: 'agent', rpc: 'kick_server', data: { code: 1, msg: 'terminal' },
+        } });
+      }
+
+      assert.equal(
+        calls,
+        callsBeforeTermination + (terminal === 'fatal' ? 1 : 0),
+        'observers must be inactive before terminal cleanup callbacks',
+      );
+      const callsAtTermination = calls;
+      const lateListener = retainedListener as Parameters<PlatformStore['subscribe']>[0] | null;
+      assert.ok(lateListener);
+      lateListener(setup.runtime.state, setup.runtime.state);
+      assert.equal(calls, callsAtTermination);
+      assert.throws(
+        () => setup.runtime.subscribeState(() => {}, () => {}),
+        new RegExp(terminal === 'kick' ? 'kicked' : terminal),
+      );
+    } finally {
+      PlatformStore.prototype.subscribe = originalSubscribe;
+    }
+  });
+}
+
+test('stop during a Store commit cancels later observers and prevents scene revival', async () => {
+  const setup = makeRuntime();
+  await setup.runtime.start();
+  setup.wire.emit({ type: 'open', server: 'ws://agent' });
+  let laterObserverCalls = 0;
+  let resubscribeFailure: unknown;
+  setup.runtime.subscribeState(
+    () => {
+      setup.runtime.stop();
+      resubscribeFailure = thrownValue(
+        () => setup.runtime.subscribeState(() => {}, () => {}),
+      );
+    },
+    error => { throw error; },
+  );
+  setup.runtime.subscribeState(
+    () => { laterObserverCalls += 1; },
+    error => { throw error; },
+  );
+  const sceneCallsBefore = setup.scene.calls.length;
+
+  setup.wire.emit({ type: 'slow' });
+
+  assert.equal(laterObserverCalls, 0);
+  assert.match(String(resubscribeFailure), /stopped/);
+  assert.equal(setup.scene.calls.length, sceneCallsBefore);
+  assert.equal(setup.wire.stopCalls, 1);
+});
+
+test('listener and onError failures after stopping escape the Store boundary without reviving fatal', async () => {
+  const setup = makeRuntime();
+  await setup.runtime.start();
+  setup.wire.emit({ type: 'open', server: 'ws://agent' });
+  const listenerFailure = { source: 'listener-after-stop' };
+  const onErrorFailure = { source: 'onError-after-stop' };
+  const reported: unknown[] = [];
+  setup.runtime.subscribeState(
+    () => {
+      setup.runtime.stop();
+      throw listenerFailure;
+    },
+    error => {
+      reported.push(error);
+      setup.runtime.stop();
+      throw onErrorFailure;
+    },
+  );
+  const sceneCallsBefore = setup.scene.calls.length;
+
+  const thrown = thrownValue(() => { setup.wire.emit({ type: 'slow' }); });
+
+  assert.deepEqual(reported, [listenerFailure]);
+  assert.ok(thrown instanceof Error);
+  const errors = (thrown as Error & { readonly errors: readonly unknown[] }).errors;
+  assert.equal(errors.length, 2);
+  assert.equal(errors[0], listenerFailure);
+  assert.equal(errors[1], onErrorFailure);
+  assert.equal(setup.scene.calls.length, sceneCallsBefore);
+  assert.equal(setup.scene.calls.filter(call => call.name === 'fatal').length, 0);
+  assert.equal(setup.wire.stopCalls, 1);
+  assert.throws(() => setup.runtime.subscribeState(() => {}, () => {}), /stopped/);
+});
+
+test('stopped observer errors survive a later active-room publish failure', async () => {
+  const setup = makeRuntime();
+  await setup.runtime.start();
+  setup.wire.emit({ type: 'open', server: 'ws://agent' });
+  setup.runtime.login(ACCOUNT);
+  const roomLogin = fixture('player-login-room.json');
+  (roomLogin.players as unknown[])[2] = {
+    playerid: 430512,
+    nickname: '同桌玩家',
+    avatar: 'http://b',
+    sex: 0,
+    bean: 10,
+    isprepare: 0,
+    onstate: 0,
+  };
+  setup.wire.emit({ type: 'message', message: {
+    route: 'agent', rpc: 'player_login', data: roomLogin,
+  } });
+  const listenerFailure = { source: 'room-listener-after-stop' };
+  const onErrorFailure = { source: 'room-onError-after-stop' };
+  setup.runtime.subscribeState(
+    () => {
+      setup.runtime.stop();
+      throw listenerFailure;
+    },
+    () => { throw onErrorFailure; },
+  );
+
+  const thrown = thrownValue(() => {
+    setup.wire.emit({ type: 'message', message: {
+      route: 'room', rpc: 'player_prepare', data: { seat: 2 },
+    } });
+  });
+
+  assert.ok(thrown instanceof Error);
+  const errors = (thrown as Error & { readonly errors: readonly unknown[] }).errors;
+  assert.equal(errors.length, 2);
+  const observerFailure = errors[0];
+  assert.ok(observerFailure instanceof Error);
+  const observerErrors = (
+    observerFailure as Error & { readonly errors: readonly unknown[] }
+  ).errors;
+  assert.equal(observerErrors[0], listenerFailure);
+  assert.equal(observerErrors[1], onErrorFailure);
+  assert.match(String(errors[1]), /disposed game session/i);
+  assert.equal(setup.scene.calls.filter(call => call.name === 'fatal').length, 0);
+  assert.throws(() => setup.runtime.subscribeState(() => {}, () => {}), /stopped/);
+});
+
+test('UI observers receive each committed snapshot even when a listener commits reentrantly', async () => {
+  const setup = makeRuntime();
+  const delivered: unknown[] = [];
+  let firstCommit: unknown;
+  let latestDuringFirstCommit: unknown;
+  let reentered = false;
+  setup.runtime.subscribeState(
+    state => {
+      if (reentered) return;
+      reentered = true;
+      firstCommit = state;
+      setup.wire.emit({ type: 'slow' });
+      latestDuringFirstCommit = setup.runtime.state;
+    },
+    error => { throw error; },
+  );
+  setup.runtime.subscribeState(
+    state => { delivered.push(state); },
+    error => { throw error; },
+  );
+  await setup.runtime.start();
+
+  setup.wire.emit({ type: 'open', server: 'ws://agent' });
+
+  assert.notEqual(firstCommit, latestDuringFirstCommit);
+  assert.equal(delivered[0], firstCommit);
+  assert.equal(delivered[1], latestDuringFirstCommit);
+  assert.deepEqual(
+    delivered.map(state => (state as { app: { phase: string } }).app.phase),
+    ['connected', 'slow'],
+  );
+  setup.runtime.stop();
+});
+
+test('cancelling and subscribing observers during a commit cannot alter that delivery snapshot', async () => {
+  const setup = makeRuntime();
+  let cancelledCalls = 0;
+  const replacementPhases: string[] = [];
+  let changedObservers = false;
+  let offCancelled = (): void => {};
+  setup.runtime.subscribeState(
+    () => {
+      if (changedObservers) return;
+      changedObservers = true;
+      offCancelled();
+      setup.runtime.subscribeState(
+        state => { replacementPhases.push(state.app.phase); },
+        error => { throw error; },
+      );
+    },
+    error => { throw error; },
+  );
+  offCancelled = setup.runtime.subscribeState(
+    () => { cancelledCalls += 1; },
+    error => { throw error; },
+  );
+  await setup.runtime.start();
+
+  setup.wire.emit({ type: 'open', server: 'ws://agent' });
+  assert.equal(cancelledCalls, 0);
+  assert.deepEqual(replacementPhases, []);
+
+  setup.wire.emit({ type: 'slow' });
+  assert.equal(cancelledCalls, 0);
+  assert.deepEqual(replacementPhases, ['slow']);
+  setup.runtime.stop();
+});
+
 test('a denied join retains the lobby root, reports the raw outcome and permits a valid retry', async () => {
   const { runtime, wire, scene } = makeRuntime();
   await runtime.start();