修复AI游戏创作跨平台运行竞态

保存独立进程组标识并在启动失败或退出时清理后代进程

兼容macOS下带前置选项的npm脚本命令校验

修复进程会话输出上限投影、测试夹具与锁污染问题

收敛Agent运行时lane释放、并发锁初始化与异步审计时序竞态

补充Node与Native Shell回归测试并同步排障文档

apps/ai-game-creator-shell/scripts/start-dev-stack.mjs

@@ -187,7 +187,13 @@ function spawnChild(command, args, options, spawnImpl = spawn) {
     detached: !useShell,
     stdio: 'inherit',
   });
-  const lifecycle = { failure: null, promise: null };
+  const lifecycle = {
+    failure: null,
+    promise: null,
+    // detached 子进程在 POSIX 下以自身 PID 作为 PGID。leader 退出后
+    // child.pid 仍是清理其后代的唯一稳定句柄，必须随生命周期保留。
+    processGroupId: !useShell && Number.isInteger(child.pid) ? child.pid : null,
+  };
   lifecycle.promise = new Promise((resolveLifecycle) => {
     child.once('error', (error) => {
       lifecycle.failure = { type: 'error', error };
@@ -231,21 +237,36 @@ function formatChildFailure(failure) {
 }
 
 function stopChild(child, signal = 'SIGTERM') {
-  if (!child || child.exitCode != null || child.signalCode != null) {
+  if (!child) {
+    return;
+  }
+
+  if (process.platform !== 'win32') {
+    const processGroupId = childLifecycles.get(child)?.processGroupId;
+    if (Number.isInteger(processGroupId)) {
+      try {
+        process.kill(-processGroupId, signal);
+        return;
+      } catch (error) {
+        if (error?.code === 'ESRCH') {
+          return;
+        }
+        // leader 尚存活时保留 direct child fallback；leader 已退出则仍以
+        // 负 PGID kill 的失败为准，不能误以为 descendants 已清理。
+        if (child.exitCode != null || child.signalCode != null) {
+          return;
+        }
+      }
+    }
+  }
+
+  if (child.exitCode != null || child.signalCode != null) {
     return;
   }
   try {
-    if (process.platform !== 'win32' && Number.isInteger(child.pid)) {
-      process.kill(-child.pid, signal);
-    } else {
-      child.kill(signal);
-    }
+    child.kill(signal);
   } catch {
-    try {
-      child.kill(signal);
-    } catch {
-      // ignore cleanup races
-    }
+    // ignore cleanup races
   }
 }