guide层v1: 全局向导交互层落地(状态签名earcon/turn cue/静默看门狗/纠错) + 6游戏接线 + 8句向导语音 + 测试全绿

- engine/guide.js 运行时合成8个签名earcon(方法论L2硬参数)，off档零定时器，插播queue不顶对白
- settings: guide三档(full/standard/off默认full) + 语速2.2视障档；audio: isVoicePlaying()/setRateBoostEnabled() 清两个已知问题
- 6游戏按schemes§2接线: storyline看门狗+无效手势纠错、simon免扣重听看门狗、escape turn cue+提前卡关提示、rhythm gd_answer/gd_miss+结算看门狗+快进豁免、space首撞指令提示+结算看门狗、rpg格挡纠错+60s催促+状态签名
- 大厅设置面板+向导文档(14-guide-layer.md)+00-global-ux §6；R5台词表补4条一致性
- 试玩转写含向导事件；6 playtest(guide=off断言零改动)+guide.test(34断言)+资产终检全绿

web/harness/mock.mjs

@@ -38,8 +38,20 @@ export function installMock(gameDir) {
     return id;
   };
   globalThis.clearTimeout = (id) => { timers.delete(id); };
-  globalThis.clearInterval = (id) => { timers.delete(id); };
-  globalThis.setInterval = globalThis.setTimeout; // 转写场景无真实 interval 语义需求
+  // 真·可重复的虚拟 interval：rhythm 的 40ms 调度泵、escape 的 5s 卡关轮询都依赖它
+  const intervals = new Set();
+  globalThis.setInterval = (cb, ms = 0, ...args) => {
+    const id = timerSeq++;
+    intervals.add(id);
+    const step = (...a) => {
+      if (!intervals.has(id)) return; // 已被 clearInterval
+      cb(...a);
+      if (intervals.has(id)) timers.set(id, { fireAt: now + Math.max(0, Number(ms) || 0), cb: step, args });
+    };
+    timers.set(id, { fireAt: now + Math.max(0, Number(ms) || 0), cb: step, args });
+    return id;
+  };
+  globalThis.clearInterval = (id) => { intervals.delete(id); timers.delete(id); };
   Object.defineProperty(globalThis, 'performance', { value: { now: () => now }, configurable: true });
 
   async function flush(rounds = 8) {
@@ -104,9 +116,10 @@ export function installMock(gameDir) {
   }
   class MockAudioContext {
     constructor() {
-      this.state = 'running'; this.currentTime = 0; this.destination = {};
-      this.sampleRate = 44100;
+      this.state = 'running'; this.destination = {}; this.sampleRate = 44100;
     }
+    // 跟随虚拟时钟：rhythm 等用 ctx.currentTime 绝对排程的游戏才能在无头环境推进
+    get currentTime() { return now / 1000; }
     createGain() { return new MockGainNode(); }
     createOscillator() { return new MockOscillator(); }
     createDynamicsCompressor() {