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/index.html

@@ -132,6 +132,15 @@
           <option value="1">正常</option>
           <option value="1.35">快</option>
           <option value="1.7">特快</option>
+          <option value="2.2">特快++</option>
+        </select>
+      </div>
+      <div class="setting-item">
+        <label for="sel-guide">向导帮助</label>
+        <select id="sel-guide">
+          <option value="full">详细</option>
+          <option value="standard">只听提示音</option>
+          <option value="off">关闭</option>
         </select>
       </div>
       <div class="setting-item">
@@ -283,12 +292,14 @@
     const selVoice = document.getElementById('sel-voice');
     const selSpeed = document.getElementById('sel-speed');
     const selBgm = document.getElementById('sel-bgm');
+    const selGuide = document.getElementById('sel-guide');
 
     function reflectSettings() {
       const s = settings.get();
       selVoice.value = s.voice;
       selSpeed.value = String(s.speed);
       selBgm.value = String(s.bgm);
+      selGuide.value = s.guide;
     }
 
     function onSettingChange() {
@@ -296,6 +307,7 @@
         voice: selVoice.value,
         speed: Number(selSpeed.value),
         bgm: Number(selBgm.value),
+        guide: selGuide.value,
       };
       settings.set(patch); // 始终写 localStorage
       // 已登录时同步到服务器（game 键 '_settings'）
@@ -309,6 +321,7 @@
     selVoice.onchange = onSettingChange;
     selSpeed.onchange = onSettingChange;
     selBgm.onchange = onSettingChange;
+    selGuide.onchange = onSettingChange;
 
     // 登录后从服务器拉回设置（服务器为准）
     async function pullSettings() {