feat(runtime): U07 生命周期装配 + stub 装配冒烟（ACM2-10 U07/U01 遗留）

- PipelineLifecycle：ServerStartupEvent 后在专用单线程（msgx-pump/msgx-dispatcher，daemon）
  拉起 Pump/Dispatcher 循环；停机 requestStop+interrupt+join；@Requires(msgx.pipeline.autostart=true)
- PipelineProps.pipeline.autostart（默认 false，生产/测试默认不自动起循环，防泄漏线程）
- stub 装配（infra/stub，@Requires(msgx.stubs=true)）：7 仓储内存实装 + StubXmlCodec（未实装
  → CODEC_ERROR 走 FAILED 可重放路径）+ StubRedis + StubDeliveryPort + Holder Factory
- 配置：application-dev.yml（stubs+autostart，/env、/beans 放开，无需 DB 即可 dev 跑通）；
  application-test.yml（stubs=true、autostart=false）；README 补 dev stub 运行说明
- PipelineSmokeTest（4）：等价 /beans 装配核验 + 收报→主泵领取→FAILED(CODEC_ERROR) + U11 重放
  回 PENDING + Dispatcher flush 聚合（stub 用例前清内存状态防上下文复用串扰）
- 全量测试 34 个通过

src/main/kotlin/com/gzzn/omms/msgexchange/nextgen/PipelineLifecycle.kt

@@ -0,0 +1,50 @@
+package com.gzzn.omms.msgexchange.nextgen
+
+import com.gzzn.omms.msgexchange.nextgen.delivery.Dispatcher
+import com.gzzn.omms.msgexchange.nextgen.processing.Pump
+import io.micronaut.context.annotation.Requires
+import io.micronaut.runtime.event.annotation.EventListener
+import io.micronaut.runtime.server.event.ServerStartupEvent
+import jakarta.annotation.PreDestroy
+import jakarta.inject.Singleton
+
+/**
+ * U07（T03+N29）：管道生命周期装配——服务启动（ServerStartupEvent）后，在各自专用单线程
+ * （msgx-pump / msgx-dispatcher，不占用 Netty event loop）上拉起 Pump 与 Dispatcher 循环；
+ * 停机时 requestStop + interrupt + join。仅当 `msgx.pipeline.autostart=true` 时装配
+ * （默认关：需要真实仓储或 msgx.stubs=true 才安全开启）。
+ */
+@Requires(property = "msgx.pipeline.autostart", value = "true")
+@Singleton
+class PipelineLifecycle(
+    private val pump: Pump,
+    private val dispatcher: Dispatcher,
+) {
+    private val threads = mutableListOf<Thread>()
+
+    @Volatile
+    private var started = false
+
+    @EventListener
+    fun start(event: ServerStartupEvent) {
+        startIfNeeded()
+    }
+
+    private fun startIfNeeded() {
+        if (started) return
+        started = true
+        threads += spawn("msgx-pump", pump::loop)
+        threads += spawn("msgx-dispatcher", dispatcher::loop)
+    }
+
+    private fun spawn(name: String, body: () -> Unit): Thread =
+        Thread.ofPlatform().name(name).daemon(true).start { body() }
+
+    @PreDestroy
+    fun stop() {
+        pump.stop()
+        dispatcher.stop()
+        threads.forEach { it.interrupt() }          // 解除 Thread.sleep 阻塞，加速退出
+        threads.forEach { runCatching { it.join(3000) } }
+    }
+}