diff --git a/backend/cmd/scert-nginx/main_linux_test.go b/backend/cmd/scert-nginx/main_linux_test.go
new file mode 100644
index 0000000..a5c707b
--- /dev/null
+++ b/backend/cmd/scert-nginx/main_linux_test.go
@@ -0,0 +1,81 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func TestInheritedListener(t *testing.T) {
+	if mode := os.Getenv("SCERT_LISTENER_TEST_CHILD"); mode != "" {
+		os.Setenv("LISTEN_PID", strconv.Itoa(os.Getpid()))
+		os.Setenv("LISTEN_FDS", "1")
+		switch mode {
+		case "pid":
+			os.Setenv("LISTEN_PID", "0")
+		case "fds":
+			os.Setenv("LISTEN_FDS", "2")
+		}
+		listener, err := inheritedListener(os.Getenv("SCERT_LISTENER_TEST_PATH"))
+		if mode == "valid" {
+			if err != nil {
+				t.Fatal(err)
+			}
+			if err := listener.Close(); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := os.Lstat(os.Getenv("SCERT_LISTENER_TEST_PATH")); err != nil {
+				t.Fatal("继承监听器关闭不应删除 systemd socket", err)
+			}
+		} else if err == nil {
+			listener.Close()
+			t.Fatal("无效继承监听器被接受")
+		}
+		fmt.Println("INHERITED_LISTENER_VERIFIED")
+		return
+	}
+	for _, mode := range []string{"valid", "pid", "fds", "path", "tcp"} {
+		t.Run(mode, func(t *testing.T) {
+			path := filepath.Join(t.TempDir(), "a.sock")
+			var listener net.Listener
+			var file *os.File
+			var err error
+			if mode == "tcp" {
+				tcp, listenErr := net.ListenTCP("tcp4", &net.TCPAddr{IP: net.IPv4(127, 0, 0, 1)})
+				if listenErr != nil {
+					t.Fatal(listenErr)
+				}
+				listener = tcp
+				file, err = tcp.File()
+			} else {
+				unix, listenErr := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
+				if listenErr != nil {
+					t.Fatal(listenErr)
+				}
+				unix.SetUnlinkOnClose(false)
+				listener = unix
+				file, err = unix.File()
+			}
+			defer listener.Close()
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer file.Close()
+			if mode == "path" {
+				path += ".wrong"
+			}
+			command := exec.Command(os.Args[0], "-test.run=^TestInheritedListener$")
+			command.Env = append(os.Environ(), "SCERT_LISTENER_TEST_CHILD="+mode, "SCERT_LISTENER_TEST_PATH="+path)
+			command.ExtraFiles = []*os.File{file}
+			output, err := command.CombinedOutput()
+			if err != nil || !strings.Contains(string(output), "INHERITED_LISTENER_VERIFIED") {
+				t.Fatalf("继承监听器子进程失败：%s, %v", output, err)
+			}
+		})
+	}
+}
diff --git a/backend/internal/nginxactivation/README.md b/backend/internal/nginxactivation/README.md
new file mode 100644
index 0000000..13906dc
--- /dev/null
+++ b/backend/internal/nginxactivation/README.md
@@ -0,0 +1,43 @@
+# Nginx 本地激活组件
+
+本组件负责受限的 Nginx 管理证书事务，不是完整的管理证书自动续期协调器。当前不能仅凭组件测试通过就解除应用内代理续期保护。
+
+## 权限边界
+
+- `scert-nginx` 独立命令只在 Linux 上运行，以 root 身份加载 root 所有且不可由其他用户写入的独立策略文件。
+- 仅接受 systemd 提供的单个 Unix 流监听器，验证进程编号、描述符数量和固定 socket 路径；不自行监听 TCP、不删除 socket。
+- 服务端通过 `SO_PEERCRED` 核对固定非 root UID；客户端同时验证 socket 路径及父目录和服务端内核 UID。
+- 请求不能提供命令、配置路径、证书磁盘路径、上游地址或域名；这些值只能来自独立策略。策略引用的 Nginx 配置及其 include 依赖仍须由部署者维护为可信配置。
+- `Directory` 及其版本目录为激活器所有的 0700 目录，私钥、证书、事务文件使用 0600。应用主进程不获得 Nginx 重载权限。
+
+## 协议与事务
+
+协议为四字节大端长度前缀和 JSON，版本为 1，帧上限为 2 MiB，拒绝未知字段和尾随内容。并发连接上限为四个；事务冲突直接返回失败，由协调者查询状态，不自动重放变更操作。
+
+| 动作 | 行为 |
+| --- | --- |
+| `ready` | 检查不存在未决事务、双层 TLS 和专用证书材料一致、Nginx 配置合法 |
+| `state` | 返回事务编号、状态和两张叶证书的 SHA-256，不返回私钥或磁盘路径 |
+| `stage` | 验证候选，持久化事务并仅切换 Nginx，成功后返回随机事务编号 |
+| `commit` | 确认双层已使用候选证书，再记录提交 |
+| `reconcile` | 依据实际上游证书回退或提交；无关证书、上游不可用或外部变更时保留未决事务 |
+
+`stage` 的应答丢失不等于没有执行。调用方必须用 `state` 查询，并结合持久化的候选摘要核对事务，不能直接重新申请证书或重试暂存。重复 `commit` 不返回幂等成功，调用方须确认查询到的是同一事务的提交终态。`reconcile` 对已完成的同一事务返回原终态，不代表重新验证了当下入口状态。
+
+激活等待要求三次间隔 100 毫秒的新连接探测连续通过，每次严格核验证书链、域名、叶证书及 Scert 就绪响应。该检查降低平滑重载过程中偶然命中新工作进程导致的误判，不构成对未来所有连接的保证。
+
+停止服务会取消活动请求并等待有界回退；监听器异常关闭报告错误。请求持有的私钥切片及帧缓冲在返回路径清理，但不声明能够擦除 Go 运行时或 JSON 解码器产生的所有内部副本。
+
+## 接入前要求
+
+1. 安装独立 socket/service，固定调用 UID，初始化专用版本目录并让目标站点引用 `active.conf`。
+2. 应用须持久化旧状态、候选摘要、激活阶段和关联事务；完整生命周期必须串行化，不能在恢复检查上游之后并发切换上游。
+3. 覆盖代理暂存、上游配置持久化与内存切换、代理提交之间的中断及应答丢失，并在启动时先恢复再允许申请下一张证书。
+4. 不可将本组件的 `Recover` 视作双层恢复。它只回退代理；`Reconcile` 也必须由了解应用持久化状态的协调者调用。
+5. 当前没有自动恢复循环、请求编号幂等机制或租约超时策略，不能宣称已具备无人值守续期闭环。
+
+## 验证范围
+
+Windows 测试只能覆盖通用协议和 TLS 探测。Linux 测试覆盖目录、文件、Unix 身份、策略、事务及继承监听器；真实 Nginx 用例需显式指定 `SCERT_TEST_NGINX_BINARY`。不同 UID 测试需在隔离 root 单元中设置 `SCERT_TEST_ROOT_IPC=1`，只在临时目录中复制测试程序并降权子进程，不修改真实用户或正式 socket。
+
+实机执行命令、程序摘要和失败修复记录见仓库 `doc/Linux生产流程测试记录.md`。
diff --git a/backend/internal/nginxactivation/client_linux_test.go b/backend/internal/nginxactivation/client_linux_test.go
new file mode 100644
index 0000000..b007f41
--- /dev/null
+++ b/backend/internal/nginxactivation/client_linux_test.go
@@ -0,0 +1,70 @@
+package nginxactivation
+
+import (
+	"context"
+	"errors"
+	"net"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestClientCancellation(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "a.sock")
+	listener, err := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	listener.SetUnlinkOnClose(false)
+	defer listener.Close()
+	if err := os.Chmod(path, 0o600); err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	clientDone := make(chan error, 1)
+	go func() {
+		_, err := (Client{SocketPath: path, ServiceUID: uint32(os.Geteuid())}).State(ctx)
+		clientDone <- err
+	}()
+	if err := listener.SetDeadline(time.Now().Add(3 * time.Second)); err != nil {
+		t.Fatal(err)
+	}
+	connection, err := listener.AcceptUnix()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer connection.Close()
+	_ = connection.SetDeadline(time.Now().Add(3 * time.Second))
+	var message request
+	if err := readFrame(connection, &message); err != nil {
+		t.Fatal(err)
+	}
+	cancel()
+	select {
+	case err := <-clientDone:
+		if !errors.Is(err, context.Canceled) {
+			t.Fatal("取消原因丢失", err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("客户端取消后没有及时关闭连接")
+	}
+}
+
+func TestServiceUnexpectedClose(t *testing.T) {
+	f := newRotationFixture(t)
+	path := filepath.Join(t.TempDir(), "a.sock")
+	listener, err := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	listener.SetUnlinkOnClose(false)
+	if err := listener.Close(); err != nil {
+		t.Fatal(err)
+	}
+	service := LocalService{Rotation: f.rotation, AllowedUID: uint32(os.Geteuid())}
+	if err := service.Serve(context.Background(), listener); !errors.Is(err, net.ErrClosed) {
+		t.Fatal("监听器异常关闭不应报告正常退出", err)
+	}
+}
diff --git a/backend/internal/nginxactivation/identity_linux_test.go b/backend/internal/nginxactivation/identity_linux_test.go
new file mode 100644
index 0000000..f6fa975
--- /dev/null
+++ b/backend/internal/nginxactivation/identity_linux_test.go
@@ -0,0 +1,187 @@
+package nginxactivation
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"testing"
+	"time"
+)
+
+func identityChild(t *testing.T, mode string) {
+	t.Helper()
+	path := os.Getenv("SCERT_IDENTITY_TEST_SOCKET")
+	if mode == "server" {
+		listener, err := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
+		if err != nil {
+			t.Fatal(err)
+		}
+		listener.SetUnlinkOnClose(false)
+		defer listener.Close()
+		_ = listener.SetDeadline(time.Now().Add(5 * time.Second))
+		fmt.Println("LISTENING")
+		connection, err := listener.AcceptUnix()
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer connection.Close()
+		_ = connection.SetDeadline(time.Now().Add(5 * time.Second))
+		var data [1]byte
+		n, err := connection.Read(data[:])
+		if n != 0 || err != io.EOF {
+			t.Fatal("客户端向不可信服务发送了数据", n, err)
+		}
+		fmt.Println("IDENTITY_VERIFIED")
+		return
+	}
+	connection, err := net.DialTimeout("unix", path, time.Second)
+	if err != nil {
+		t.Fatal("未到达内核身份检查边界", err)
+	}
+	defer connection.Close()
+	_ = connection.SetDeadline(time.Now().Add(3 * time.Second))
+	err = writeFrame(connection, request{Version: protocolVersion, Action: "state"})
+	var result response
+	if err == nil {
+		err = readFrame(connection, &result)
+	}
+	if mode == "allowed" {
+		if err != nil || result.Code != "ok" || result.State == nil || result.State.Status != "idle" {
+			t.Fatal("合法非特权进程未通过身份校验", err)
+		}
+	} else if err == nil {
+		t.Fatal("非授权进程获得了响应")
+	}
+	fmt.Println("IDENTITY_VERIFIED")
+}
+
+func TestRootPeerIdentity(t *testing.T) {
+	if mode := os.Getenv("SCERT_IDENTITY_TEST_CHILD"); mode != "" {
+		identityChild(t, mode)
+		return
+	}
+	if os.Getenv("SCERT_TEST_ROOT_IPC") != "1" {
+		t.Skip("仅在显式启用的 root 隔离测试单元内执行不同 UID 测试")
+	}
+	if os.Geteuid() != 0 {
+		t.Fatal("不同 UID 测试要求隔离单元以 root 运行")
+	}
+	base := t.TempDir()
+	for _, path := range []string{base, filepath.Dir(base)} {
+		if err := os.Chmod(path, 0o755); err != nil {
+			t.Fatal(err)
+		}
+	}
+	// 为降权子进程复制独立测试程序，避免放宽正式目录的访问权限。
+	source, err := os.Open(os.Args[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer source.Close()
+	executable := filepath.Join(base, "identity.test")
+	copy, err := os.OpenFile(executable, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o755)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, copyErr := io.Copy(copy, source)
+	closeErr := copy.Close()
+	if copyErr != nil || closeErr != nil {
+		t.Fatal(copyErr, closeErr)
+	}
+	command := func(mode, path string, uid uint32) (*exec.Cmd, context.CancelFunc) {
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		cmd := exec.CommandContext(ctx, executable, "-test.run=^TestRootPeerIdentity$")
+		cmd.Env = append(os.Environ(), "SCERT_IDENTITY_TEST_CHILD="+mode, "SCERT_IDENTITY_TEST_SOCKET="+path)
+		cmd.SysProcAttr = &syscall.SysProcAttr{Credential: &syscall.Credential{Uid: uid, Gid: uid}}
+		return cmd, cancel
+	}
+	t.Run("caller", func(t *testing.T) {
+		f := newRotationFixture(t)
+		path := filepath.Join(base, "service.sock")
+		listener, err := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
+		if err != nil {
+			t.Fatal(err)
+		}
+		listener.SetUnlinkOnClose(false)
+		// 此用例故意放宽 inode 权限，只验证内核 UID 拒绝，而非文件权限拒绝。
+		if err := os.Chmod(path, 0o666); err != nil {
+			t.Fatal(err)
+		}
+		ctx, cancel := context.WithCancel(context.Background())
+		done := make(chan error, 1)
+		service := LocalService{Rotation: f.rotation, AllowedUID: 65534}
+		go func() { done <- service.Serve(ctx, listener) }()
+		defer stopLocalService(t, cancel, done)
+		for _, peer := range []struct {
+			mode string
+			uid  uint32
+		}{{"allowed", 65534}, {"denied", 65533}} {
+			cmd, stop := command(peer.mode, path, peer.uid)
+			output, err := cmd.CombinedOutput()
+			stop()
+			if err != nil || !strings.Contains(string(output), "IDENTITY_VERIFIED") {
+				t.Fatalf("UID %d 身份验证失败：%s, %v", peer.uid, output, err)
+			}
+		}
+		if state, err := f.rotation.State(context.Background()); err != nil || state.Status != "idle" {
+			t.Fatal("身份验证改变了事务状态", state, err)
+		}
+	})
+	t.Run("server", func(t *testing.T) {
+		parent := filepath.Join(base, "server")
+		if err := os.Mkdir(parent, 0o755); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.Chmod(parent, 0o777); err != nil {
+			t.Fatal(err)
+		}
+		path := filepath.Join(parent, "service.sock")
+		cmd, cancel := command("server", path, 65534)
+		defer cancel()
+		output, err := cmd.StdoutPipe()
+		if err != nil {
+			t.Fatal(err)
+		}
+		var stderr strings.Builder
+		cmd.Stderr = &stderr
+		if err := cmd.Start(); err != nil {
+			t.Fatal(err)
+		}
+		defer func() { cancel(); _ = cmd.Wait() }()
+		scanner := bufio.NewScanner(output)
+		if !scanner.Scan() || scanner.Text() != "LISTENING" {
+			t.Fatal("身份模拟服务未启动")
+		}
+		// inode 看起来由 root 管理，但真正的监听创建者仍是非特权进程。
+		if err := os.Chown(path, 0, 0); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.Chmod(path, 0o600); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.Chmod(parent, 0o755); err != nil {
+			t.Fatal(err)
+		}
+		if err := validateSocket(path, 0); err != nil {
+			t.Fatal("未到达服务内核身份检查", err)
+		}
+		_, err = (Client{SocketPath: path}).State(context.Background())
+		if err == nil || err.Error() != "本地激活服务身份不可信" {
+			t.Fatal("未拒绝服务身份伪装", err)
+		}
+		verified := false
+		for scanner.Scan() {
+			verified = verified || scanner.Text() == "IDENTITY_VERIFIED"
+		}
+		if err := cmd.Wait(); err != nil || !verified {
+			t.Fatal("身份模拟服务验证失败", err, stderr.String())
+		}
+	})
+}
diff --git a/backend/internal/nginxactivation/ipc_linux.go b/backend/internal/nginxactivation/ipc_linux.go
index eef5cc5..efea1f5 100644
--- a/backend/internal/nginxactivation/ipc_linux.go
+++ b/backend/internal/nginxactivation/ipc_linux.go
@@ -59,8 +59,9 @@ func (s LocalService) Serve(ctx context.Context, listener *net.UnixListener) err
 	for {
 		connection, err := listener.AcceptUnix()
 		if err != nil {
+			stopping := ctx.Err() != nil
 			cancel()
-			if errors.Is(err, net.ErrClosed) && ctx.Err() != nil {
+			if errors.Is(err, net.ErrClosed) && stopping {
 				return nil
 			}
 			return err
@@ -89,6 +90,7 @@ func (s LocalService) handle(ctx context.Context, connection *net.UnixConn) {
 	stop := context.AfterFunc(ctx, func() { _ = connection.Close() })
 	defer stop()
 	var message request
+	defer func() { clear(message.Key) }()
 	if err := readFrame(connection, &message); err != nil || !validRequest(message) {
 		_ = connection.SetWriteDeadline(time.Now().Add(time.Second))
 		_ = writeFrame(connection, response{Version: protocolVersion, Code: "invalid_request"})
@@ -97,8 +99,6 @@ func (s LocalService) handle(ctx context.Context, connection *net.UnixConn) {
 	operationCtx, cancel := context.WithTimeout(ctx, operationTimeout)
 	defer cancel()
 	result := s.execute(operationCtx, message)
-	// 私钥不写入日志、错误或响应，处理结束后清理请求缓冲。
-	clear(message.Key)
 	_ = connection.SetWriteDeadline(time.Now().Add(3 * time.Second))
 	_ = writeFrame(connection, result)
 }
diff --git a/backend/internal/nginxactivation/ipc_linux_test.go b/backend/internal/nginxactivation/ipc_linux_test.go
index c238ead..ada55be 100644
--- a/backend/internal/nginxactivation/ipc_linux_test.go
+++ b/backend/internal/nginxactivation/ipc_linux_test.go
@@ -15,9 +15,13 @@ func startLocalService(t *testing.T, rotation Rotation, allowed uint32) (Client,
 	t.Helper()
 	path := filepath.Join(t.TempDir(), "activation.sock")
 	listener, err := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
-	if err != nil { t.Fatal(err) }
+	if err != nil {
+		t.Fatal(err)
+	}
 	listener.SetUnlinkOnClose(false)
-	if err := os.Chmod(path, 0o600); err != nil { t.Fatal(err) }
+	if err := os.Chmod(path, 0o600); err != nil {
+		t.Fatal(err)
+	}
 	ctx, cancel := context.WithCancel(context.Background())
 	done := make(chan error, 1)
 	service := LocalService{Rotation: rotation, AllowedUID: allowed}
@@ -31,7 +35,9 @@ func stopLocalService(t *testing.T, cancel context.CancelFunc, done <-chan error
 	cancel()
 	select {
 	case err := <-done:
-		if err != nil { t.Fatal(err) }
+		if err != nil {
+			t.Fatal(err)
+		}
 	case <-time.After(5 * time.Second):
 		t.Fatal("本地激活服务未及时退出")
 	}
@@ -46,15 +52,21 @@ func TestLocalServiceRoundTrip(t *testing.T) {
 		t.Fatal("就绪查询失败", ready, err)
 	}
 	id, err := client.Stage(ctx, f.candidate.chain, f.candidate.key)
-	if err != nil { t.Fatal(err) }
+	if err != nil {
+		t.Fatal(err)
+	}
 	state, err := client.State(ctx)
 	if err != nil || state.ID != id || state.Status != "staged" {
 		t.Fatalf("事务查询失败：%+v, %v", state, err)
 	}
 	f.upstream.active.Store(&f.candidate.pair)
-	if err := client.Commit(ctx, id); err != nil { t.Fatal(err) }
+	if err := client.Commit(ctx, id); err != nil {
+		t.Fatal(err)
+	}
 	state, err = client.State(ctx)
-	if err != nil || state.Status != "committed" { t.Fatal(state, err) }
+	if err != nil || state.Status != "committed" {
+		t.Fatal(state, err)
+	}
 	if state, err := client.Reconcile(ctx, id); err != nil || state.Status != "committed" {
 		t.Fatal(state, err)
 	}
@@ -89,9 +101,13 @@ func TestLocalServiceRejectsUnsafeMessages(t *testing.T) {
 		{Version: 1, Action: "stage", Chain: []byte("pem")},
 	} {
 		connection, err := net.Dial("unix", client.SocketPath)
-		if err != nil { t.Fatal(err) }
+		if err != nil {
+			t.Fatal(err)
+		}
 		_ = connection.SetDeadline(time.Now().Add(time.Second))
-		if err := writeFrame(connection, message); err != nil { t.Fatal(err) }
+		if err := writeFrame(connection, message); err != nil {
+			t.Fatal(err)
+		}
 		var result response
 		err = readFrame(connection, &result)
 		_ = connection.Close()
@@ -100,50 +116,82 @@ func TestLocalServiceRejectsUnsafeMessages(t *testing.T) {
 		}
 	}
 	connection, err := net.Dial("unix", client.SocketPath)
-	if err != nil { t.Fatal(err) }
+	if err != nil {
+		t.Fatal(err)
+	}
 	defer connection.Close()
 	_ = connection.SetDeadline(time.Now().Add(time.Second))
 	var header [4]byte
 	binary.BigEndian.PutUint32(header[:], maxFrameSize+1)
-	if _, err := connection.Write(header[:]); err != nil { t.Fatal(err) }
+	if _, err := connection.Write(header[:]); err != nil {
+		t.Fatal(err)
+	}
 	var result response
 	if err := readFrame(connection, &result); err != nil || result.Code != "invalid_request" {
 		t.Fatal("超限帧没有立即拒绝", result, err)
 	}
 	state, err := f.rotation.State(context.Background())
-	if err != nil || state.Status != "idle" { t.Fatal(state, err) }
+	if err != nil || state.Status != "idle" {
+		t.Fatal(state, err)
+	}
 }
 
 func TestLocalServiceLostStageResponseCanReconcile(t *testing.T) {
 	f := newRotationFixture(t)
+	started := make(chan struct{})
+	f.reloader.check = func(number int) error {
+		if number == 1 {
+			close(started)
+		}
+		return nil
+	}
 	client, cancel, done := startLocalService(t, f.rotation, uint32(os.Geteuid()))
 	defer stopLocalService(t, cancel, done)
 	connection, err := net.Dial("unix", client.SocketPath)
-	if err != nil { t.Fatal(err) }
+	if err != nil {
+		t.Fatal(err)
+	}
 	if err := writeFrame(connection, request{Version: 1, Action: "stage", Chain: f.candidate.chain, Key: f.candidate.key}); err != nil {
 		t.Fatal(err)
 	}
+	// 先确认暂存取得事务锁，避免状态查询抢锁使请求在开始前就失败。
+	select {
+	case <-started:
+	case <-time.After(3 * time.Second):
+		_ = connection.Close()
+		t.Fatal("暂存请求未开始执行")
+	}
 	_ = connection.Close()
 	ctx, stop := context.WithTimeout(context.Background(), 3*time.Second)
 	defer stop()
 	var state State
 	for {
 		state, err = client.State(ctx)
-		if err == nil && state.Status == "staged" { break }
-		if ctx.Err() != nil { t.Fatal("丢失响应后未找到暂存事务", state, err) }
-		time.Sleep(10*time.Millisecond)
+		if err == nil && state.Status == "staged" {
+			break
+		}
+		if ctx.Err() != nil {
+			t.Fatal("丢失响应后未找到暂存事务", state, err)
+		}
+		time.Sleep(10 * time.Millisecond)
 	}
 	state, err = client.Reconcile(ctx, state.ID)
-	if err != nil || state.Status != "rolled_back" { t.Fatal(state, err) }
+	if err != nil || state.Status != "rolled_back" {
+		t.Fatal(state, err)
+	}
 }
 
 func TestLocalServiceShutdownClosesStalledClients(t *testing.T) {
 	f := newRotationFixture(t)
 	client, cancel, done := startLocalService(t, f.rotation, uint32(os.Geteuid()))
 	connection, err := net.Dial("unix", client.SocketPath)
-	if err != nil { t.Fatal(err) }
+	if err != nil {
+		t.Fatal(err)
+	}
 	defer connection.Close()
-	if _, err := connection.Write([]byte{0}); err != nil { t.Fatal(err) }
+	if _, err := connection.Write([]byte{0}); err != nil {
+		t.Fatal(err)
+	}
 	stopLocalService(t, cancel, done)
 	if _, err := os.Lstat(client.SocketPath); err != nil {
 		t.Fatal("服务停止不应删除托管 socket", err)
@@ -156,12 +204,22 @@ func TestLocalClientRejectsUntrustedSocket(t *testing.T) {
 	defer stopLocalService(t, cancel, done)
 	wrong := client
 	wrong.ServiceUID++
-	if _, err := wrong.State(context.Background()); err == nil { t.Fatal("不应信任错误所有者") }
+	if _, err := wrong.State(context.Background()); err == nil {
+		t.Fatal("不应信任错误所有者")
+	}
 	link := filepath.Join(filepath.Dir(client.SocketPath), "link.sock")
-	if err := os.Symlink(client.SocketPath, link); err != nil { t.Fatal(err) }
+	if err := os.Symlink(client.SocketPath, link); err != nil {
+		t.Fatal(err)
+	}
 	wrong = client
 	wrong.SocketPath = link
-	if _, err := wrong.State(context.Background()); err == nil { t.Fatal("不应连接符号链接") }
-	if err := os.Chmod(client.SocketPath, 0o666); err != nil { t.Fatal(err) }
-	if _, err := client.State(context.Background()); err == nil { t.Fatal("不应连接公开可写 socket") }
+	if _, err := wrong.State(context.Background()); err == nil {
+		t.Fatal("不应连接符号链接")
+	}
+	if err := os.Chmod(client.SocketPath, 0o666); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := client.State(context.Background()); err == nil {
+		t.Fatal("不应连接公开可写 socket")
+	}
 }
diff --git a/backend/internal/nginxactivation/policy_linux.go b/backend/internal/nginxactivation/policy_linux.go
index 069cfd4..2605264 100644
--- a/backend/internal/nginxactivation/policy_linux.go
+++ b/backend/internal/nginxactivation/policy_linux.go
@@ -14,16 +14,16 @@ import (
 
 // Policy 必须由 root 独立维护，不能复用 Scert 可写的应用配置。
 type Policy struct {
-	Version int `json:"version"`
-	AllowedUID *uint32 `json:"allowed_uid"`
-	SocketPath string `json:"socket_path"`
-	Directory string `json:"directory"`
-	Hostname string `json:"hostname"`
-	ProxyAddress string `json:"proxy_address"`
-	UpstreamAddress string `json:"upstream_address"`
-	NginxBinary string `json:"nginx_binary"`
-	NginxConfig string `json:"nginx_config"`
-	NginxPrefix string `json:"nginx_prefix"`
+	Version         int     `json:"version"`
+	AllowedUID      *uint32 `json:"allowed_uid"`
+	SocketPath      string  `json:"socket_path"`
+	Directory       string  `json:"directory"`
+	Hostname        string  `json:"hostname"`
+	ProxyAddress    string  `json:"proxy_address"`
+	UpstreamAddress string  `json:"upstream_address"`
+	NginxBinary     string  `json:"nginx_binary"`
+	NginxConfig     string  `json:"nginx_config"`
+	NginxPrefix     string  `json:"nginx_prefix"`
 }
 
 func LoadPolicy(path string) (Policy, error) {
@@ -51,6 +51,9 @@ func loadPolicy(path string, owner uint32) (Policy, error) {
 	if !filepath.IsAbs(policy.SocketPath) || filepath.Clean(policy.SocketPath) != policy.SocketPath || policy.SocketPath == "/" || len(policy.SocketPath) > 107 {
 		return policy, errors.New("激活 socket 路径无效")
 	}
+	if err := validateTrustedParents(filepath.Dir(policy.SocketPath), owner); err != nil {
+		return policy, err
+	}
 	if err := validateDirectory(policy.Directory); err != nil {
 		return policy, err
 	}
@@ -79,9 +82,9 @@ func loadPolicy(path string, owner uint32) (Policy, error) {
 func (p Policy) Rotation() Rotation {
 	return Rotation{
 		Directory: p.Directory,
-		Proxy: Endpoint{Address: p.ProxyAddress, Hostname: p.Hostname},
-		Upstream: Endpoint{Address: p.UpstreamAddress, Hostname: p.Hostname},
-		Reloader: CommandReloader{Binary: p.NginxBinary, Config: p.NginxConfig, Prefix: p.NginxPrefix},
+		Proxy:     Endpoint{Address: p.ProxyAddress, Hostname: p.Hostname},
+		Upstream:  Endpoint{Address: p.UpstreamAddress, Hostname: p.Hostname},
+		Reloader:  CommandReloader{Binary: p.NginxBinary, Config: p.NginxConfig, Prefix: p.NginxPrefix},
 	}
 }
 
diff --git a/backend/internal/nginxactivation/policy_linux_test.go b/backend/internal/nginxactivation/policy_linux_test.go
new file mode 100644
index 0000000..88e8ee7
--- /dev/null
+++ b/backend/internal/nginxactivation/policy_linux_test.go
@@ -0,0 +1,165 @@
+package nginxactivation
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+func newPolicyFixture(t *testing.T) (Policy, string) {
+	t.Helper()
+	directory := t.TempDir()
+	if err := os.Chmod(directory, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	uid := uint32(os.Geteuid()) + 1
+	policy := Policy{
+		Version: 1, AllowedUID: &uid,
+		SocketPath: filepath.Join(directory, "a.sock"), Directory: directory,
+		Hostname: testHostname, ProxyAddress: "127.0.0.1:443", UpstreamAddress: "127.0.0.1:9004",
+		NginxBinary: filepath.Join(directory, "nginx"), NginxConfig: filepath.Join(directory, "nginx.conf"),
+		NginxPrefix: directory,
+	}
+	writeTestFile(t, policy.NginxBinary, []byte("test executable"))
+	if err := os.Chmod(policy.NginxBinary, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	writeTestFile(t, policy.NginxConfig, []byte("events {}\n"))
+	return policy, filepath.Join(directory, "policy.json")
+}
+
+func writePolicy(t *testing.T, path string, policy Policy) {
+	t.Helper()
+	data, err := json.Marshal(policy)
+	if err != nil {
+		t.Fatal(err)
+	}
+	writeTestFile(t, path, data)
+}
+
+func TestPolicyValidation(t *testing.T) {
+	for _, scenario := range []string{
+		"valid", "version", "missing-uid", "root-uid", "socket-relative", "socket-long", "socket-parent",
+		"directory-mode", "hostname", "proxy-public", "upstream-public", "same-address", "binary-mode",
+		"binary-no-exec", "binary-setuid", "config-mode", "prefix-relative", "prefix-mode",
+	} {
+		t.Run(scenario, func(t *testing.T) {
+			policy, path := newPolicyFixture(t)
+			chmod := func(path string, mode os.FileMode) {
+				t.Helper()
+				if err := os.Chmod(path, mode); err != nil {
+					t.Fatal(err)
+				}
+			}
+			switch scenario {
+			case "version":
+				policy.Version = 2
+			case "missing-uid":
+				policy.AllowedUID = nil
+			case "root-uid":
+				*policy.AllowedUID = 0
+			case "socket-relative":
+				policy.SocketPath = "a.sock"
+			case "socket-long":
+				policy.SocketPath = "/" + strings.Repeat("a", 108)
+			case "socket-parent":
+				parent := filepath.Join(policy.Directory, "socket")
+				if err := os.Mkdir(parent, 0o700); err != nil {
+					t.Fatal(err)
+				}
+				chmod(parent, 0o777)
+				policy.SocketPath = filepath.Join(parent, "a.sock")
+			case "directory-mode":
+				chmod(policy.Directory, 0o755)
+			case "hostname":
+				policy.Hostname = "*.example.com"
+			case "proxy-public":
+				policy.ProxyAddress = "192.0.2.1:443"
+			case "upstream-public":
+				policy.UpstreamAddress = "0.0.0.0:9004"
+			case "same-address":
+				policy.UpstreamAddress = policy.ProxyAddress
+			case "binary-mode":
+				chmod(policy.NginxBinary, 0o777)
+			case "binary-no-exec":
+				chmod(policy.NginxBinary, 0o600)
+			case "binary-setuid":
+				chmod(policy.NginxBinary, 0o700|os.ModeSetuid)
+			case "config-mode":
+				chmod(policy.NginxConfig, 0o666)
+			case "prefix-relative":
+				policy.NginxPrefix = "."
+			case "prefix-mode":
+				policy.NginxPrefix = filepath.Join(policy.Directory, "prefix")
+				if err := os.Mkdir(policy.NginxPrefix, 0o700); err != nil {
+					t.Fatal(err)
+				}
+				chmod(policy.NginxPrefix, 0o777)
+			}
+			writePolicy(t, path, policy)
+			got, err := loadPolicy(path, uint32(os.Geteuid()))
+			if scenario == "valid" {
+				if err != nil || got.Hostname != policy.Hostname || got.Rotation().Directory != policy.Directory {
+					t.Fatal("合法策略未正确加载", err)
+				}
+			} else if err == nil {
+				t.Fatal("不可信策略被接受")
+			}
+		})
+	}
+}
+
+func TestPolicyFileSafety(t *testing.T) {
+	for _, scenario := range []string{"symlink", "hardlink", "fifo", "writable", "owner", "oversize", "unknown", "trailing", "null"} {
+		t.Run(scenario, func(t *testing.T) {
+			policy, path := newPolicyFixture(t)
+			writePolicy(t, path, policy)
+			owner := uint32(os.Geteuid())
+			switch scenario {
+			case "symlink":
+				link := path + ".link"
+				if err := os.Symlink(path, link); err != nil {
+					t.Fatal(err)
+				}
+				path = link
+			case "hardlink":
+				if err := os.Link(path, path+".link"); err != nil {
+					t.Fatal(err)
+				}
+			case "fifo":
+				path += ".fifo"
+				if err := unix.Mkfifo(path, 0o600); err != nil {
+					t.Fatal(err)
+				}
+			case "writable":
+				if err := os.Chmod(path, 0o666); err != nil {
+					t.Fatal(err)
+				}
+			case "owner":
+				owner++
+			case "oversize":
+				writeTestFile(t, path, []byte(strings.Repeat(" ", (16<<10)+1)))
+			case "unknown", "trailing":
+				data, err := json.Marshal(policy)
+				if err != nil {
+					t.Fatal(err)
+				}
+				if scenario == "unknown" {
+					data = append(data[:len(data)-1], []byte(`,"command":"id"}`)...)
+				} else {
+					data = append(data, []byte(`{}`)...)
+				}
+				writeTestFile(t, path, data)
+			case "null":
+				writeTestFile(t, path, []byte("null"))
+			}
+			if _, err := loadPolicy(path, owner); err == nil {
+				t.Fatal("不可信策略文件被接受")
+			}
+		})
+	}
+}
diff --git a/backend/internal/nginxactivation/probe.go b/backend/internal/nginxactivation/probe.go
index 607ffb2..c4c305d 100644
--- a/backend/internal/nginxactivation/probe.go
+++ b/backend/internal/nginxactivation/probe.go
@@ -99,10 +99,17 @@ func (e Endpoint) Wait(ctx context.Context, expected []byte) error {
 	}
 	ctx, cancel := context.WithTimeout(ctx, 20*time.Second)
 	defer cancel()
+	matched := 0
 	for {
 		_, err := e.Check(ctx, expected)
 		if err == nil {
-			return nil
+			matched++
+			// 平滑重载期间新旧工作进程可能短暂并存，单次命中不足以确认切换。
+			if matched == 3 {
+				return nil
+			}
+		} else {
+			matched = 0
 		}
 		timer := time.NewTimer(100 * time.Millisecond)
 		select {
diff --git a/backend/internal/nginxactivation/probe_test.go b/backend/internal/nginxactivation/probe_test.go
index 248f8da..27ec1e2 100644
--- a/backend/internal/nginxactivation/probe_test.go
+++ b/backend/internal/nginxactivation/probe_test.go
@@ -224,3 +224,28 @@ func TestEndpointRejectsUnsafePolicies(t *testing.T) {
 		}
 	}
 }
+
+func TestEndpointWaitRequiresConsecutiveMatches(t *testing.T) {
+	a := newAuthority(t)
+	now := time.Now()
+	old := a.issue(t, testHostname, now.Add(-time.Hour), now.Add(24*time.Hour))
+	candidate := a.issue(t, testHostname, now.Add(-time.Hour), now.Add(48*time.Hour))
+	var requests atomic.Int32
+	var endpoint *testEndpoint
+	endpoint = newTestEndpoint(t, a, candidate, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if requests.Add(1) == 1 {
+			endpoint.active.Store(&old.pair)
+		} else {
+			endpoint.active.Store(&candidate.pair)
+		}
+		_, _ = io.WriteString(w, `{"service":"scert","status":"ready"}`)
+	}))
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	if err := endpoint.Wait(ctx, candidate.pair.Certificate[0]); err != nil {
+		t.Fatal(err)
+	}
+	if requests.Load() < 5 {
+		t.Fatal("出现旧证书后未重新累计连续成功探测", requests.Load())
+	}
+}
diff --git a/backend/internal/nginxactivation/protocol.go b/backend/internal/nginxactivation/protocol.go
index 1d05135..d03b8c1 100644
--- a/backend/internal/nginxactivation/protocol.go
+++ b/backend/internal/nginxactivation/protocol.go
@@ -38,6 +38,7 @@ func readFrame(reader io.Reader, value any) error {
 		return errors.New("本地激活消息大小无效")
 	}
 	data := make([]byte, int(length))
+	defer clear(data)
 	if _, err := io.ReadFull(reader, data); err != nil {
 		return err
 	}
@@ -58,6 +59,7 @@ func writeFrame(writer io.Writer, value any) error {
 	if err != nil {
 		return err
 	}
+	defer clear(data)
 	if len(data) == 0 || len(data) > maxFrameSize {
 		return errors.New("本地激活消息超过限制")
 	}
diff --git a/backend/internal/nginxactivation/protocol_test.go b/backend/internal/nginxactivation/protocol_test.go
index e2cc9eb..64e7149 100644
--- a/backend/internal/nginxactivation/protocol_test.go
+++ b/backend/internal/nginxactivation/protocol_test.go
@@ -43,7 +43,7 @@ func TestLocalProtocolBoundsAndSchema(t *testing.T) {
 	}
 }
 
-type partialWriter struct { bytes.Buffer }
+type partialWriter struct{ bytes.Buffer }
 
 func (w *partialWriter) Write(data []byte) (int, error) {
 	if len(data) > 2 {
diff --git a/backend/internal/nginxactivation/reconcile_linux_test.go b/backend/internal/nginxactivation/reconcile_linux_test.go
index 25c9995..b2a1498 100644
--- a/backend/internal/nginxactivation/reconcile_linux_test.go
+++ b/backend/internal/nginxactivation/reconcile_linux_test.go
@@ -50,9 +50,13 @@ func TestRotationReconcileUsesActualUpstream(t *testing.T) {
 				current := f.assertStatus(t, "staged")
 				current.Status = "pending"
 				root, err := os.OpenRoot(f.rotation.Directory)
-				if err != nil { t.Fatal(err) }
+				if err != nil {
+					t.Fatal(err)
+				}
 				defer root.Close()
-				if err := saveTransaction(root, current); err != nil { t.Fatal(err) }
+				if err := saveTransaction(root, current); err != nil {
+					t.Fatal(err)
+				}
 			case "unrelated":
 				other := f.authority.issue(t, testHostname, time.Now().Add(-time.Hour), time.Now().Add(72*time.Hour))
 				f.upstream.active.Store(&other.pair)
@@ -65,7 +69,9 @@ func TestRotationReconcileUsesActualUpstream(t *testing.T) {
 			}
 			state, err := f.rotation.Reconcile(ctx, id)
 			if scenario == "unrelated" || scenario == "unavailable" || scenario == "external-include" || scenario == "wrong-id" {
-				if err == nil { t.Fatal("无法确认的状态不应完成恢复") }
+				if err == nil {
+					t.Fatal("无法确认的状态不应完成恢复")
+				}
 				f.assertStatus(t, "staged")
 				return
 			}
diff --git a/backend/internal/nginxactivation/status.go b/backend/internal/nginxactivation/status.go
index a1c504c..32c7ba8 100644
--- a/backend/internal/nginxactivation/status.go
+++ b/backend/internal/nginxactivation/status.go
@@ -9,8 +9,8 @@ type State struct {
 }
 
 type ReadyState struct {
-	Hostname     string `json:"hostname"`
-	ProxyAddress string `json:"proxy_address"`
+	Hostname        string `json:"hostname"`
+	ProxyAddress    string `json:"proxy_address"`
 	UpstreamAddress string `json:"upstream_address"`
-	LeafHash     string `json:"leaf_hash"`
+	LeafHash        string `json:"leaf_hash"`
 }
diff --git a/doc/Linux生产流程测试记录.md b/doc/Linux生产流程测试记录.md
index e263858..d868c4b 100644
--- a/doc/Linux生产流程测试记录.md
+++ b/doc/Linux生产流程测试记录.md
@@ -1,6 +1,52 @@
 # Linux 生产流程测试记录
 
-## 当前进展：Nginx 证书激活事务组件实机验证
+## 当前进展：受限本地激活服务与身份边界验证
+
+2026-09-18 02:20 起接续，修改前检查点 `cc94a61` 已推送。本轮继续验证独立辅助服务，没有替换正式二进制、安装正式 socket、重载正式 Nginx 或清空共享数据库。代理模式续期仍在申请前拒绝，完整生产验收尚未完成。
+
+### 已完成的修改
+
+- [✓] 补齐受限 Unix socket 服务、客户端及独立 root 策略的测试；仅开放 `ready/state/stage/commit/reconcile`，请求不能指定命令或路径。
+- [✓] 修复监听器异常关闭被误报为正常退出；请求校验失败也清理已解析的私钥切片，并清理编码、读取持有的帧缓冲。
+- [✓] 策略加载增加 socket 父目录信任校验，覆盖非法 UID、地址、域名、权限、符号链接、硬链接、FIFO、超限及错误 JSON。
+- [✓] 激活等待改为连续三次新连接的严格 TLS/就绪探测；补测新旧证书交替时需重新累计成功次数。
+- [✓] 实际不同 UID 子进程验证授权与拒绝；伪装服务端即使将 socket inode 改为 root 所有，客户端仍通过内核身份拒绝，不发送请求。
+- [✓] 继承 FD3 的子进程验证合法 Unix socket、错误 PID、错误 FD 数量、错误路径及 TCP 监听器拒绝，关闭不删除托管 socket。
+
+### 验证证据
+
+本地 `go test -p=2 ./...`、`go test -race ./internal/nginxactivation -count=1` 通过；竞态测试仅覆盖 Windows 通用代码。Linux 目标 `go vet ./internal/nginxactivation ./cmd/scert-nginx`、辅助命令构建及两类测试程序交叉编译通过。
+
+远端测试程序位于 `/scert/acceptance-20260917-1044/`，同名本地文件位于 `.runtime/`；上传前后 SHA-256 一致：
+
+| 文件 | SHA-256 |
+| --- | --- |
+| `nginx-ipc-20260918-0240.test` | `0c41d5a0f0fd7990bb33377280af651054198529eef076adeedf7d0a3bd5d497` |
+| `nginx-listener-20260918-0230.test` | `c99dc7ef748ec8c6b3219859d7c070935c77312449b4338ce9e8539e28e3ea1e` |
+
+`scert-nginx-ipc-20260918-0240.service` 以 Scert 用户运行，私有网络与临时目录、只读系统、隐藏用户目录、禁止提权，限制 192 MiB 内存、禁用 Swap、CPU 50%、64 个任务。通过 `InaccessiblePaths` 隐藏 `/scert/conf /scert/data /scert/log /scert/backups /ssl-scert-acceptance -/ssl`。显式使用 `/usr/sbin/nginx`，以 `-test.timeout=150s -test.count=10` 连续十轮通过，退出零，运行 111.123 秒、CPU 7.418 秒、峰值内存 21.9 MiB。不同 UID 用例在非 root 单元中按设计跳过，在下列独立 root 单元中执行。
+
+`scert-nginx-listener-20260918-0230.service` 使用同类非特权隔离，继承监听器五个场景连续三轮通过，退出零，运行 170 毫秒、峰值内存 6.1 MiB。
+
+`scert-nginx-identity-20260918-0242.service` 是仅执行身份边界用例的临时 root 隔离单元，保持私有网络、私有临时目录、只读系统和正式数据不可访问，能力限制为 `CAP_CHOWN CAP_SETUID CAP_SETGID CAP_DAC_OVERRIDE` 并显式设为环境能力。设置 `SCERT_TEST_ROOT_IPC=1`，以 `-test.run=^TestRootPeerIdentity$ -test.count=3` 验证实际 UID 65534 的授权请求、UID 65533 的拒绝及非 root 服务身份伪装，全部通过，运行 310 毫秒、峰值内存 32.6 MiB。没有向正式 Scert 服务增加能力。
+
+最终留档单元 `scert-nginx-ipc-final-20260918-0244.service` 使用相同最终测试程序再运行一轮，31 项顶层测试通过，仅 root 身份用例按设计跳过；该用例已在上面的独立单元通过。最终单元运行 11.094 秒、峰值内存 20.3 MiB，详细日志保存在 systemd journal，可使用 `journalctl -u scert-nginx-ipc-final-20260918-0244.service` 复核。
+
+2026-09-18 02:42 结束检查：正式 Scert PID `589832`、Nginx PID `578671`、MySQL PID `589785` 均未变化；正式程序 SHA-256 仍为 `f5b08bf0fb88f7b19281e91f942aa2995866f96420e422c015890b841bae6366`，Nginx 主配置及 Scert 站点摘要与本轮开始一致。最终测试与身份测试单元均已退出，PID 为零。`nginx -t` 通过，使用管理域名严格验证回环 TLS 后 `/readyz` 返回 200 和 `ready`。本轮不包含浏览器或新增公网验收。
+
+### 失败与修复记录
+
+初始测试单元因误写不存在的 `/scert/logs` 在执行测试前出现 `226/NAMESPACE`；核实正式日志目录为 `/scert/log` 后修正隔离参数。旧测试程序 `nginx-ipc-20260918-0230.test` 重复运行暴露应答丢失用例的抢锁竞争，以及真实 Nginx 单次探测成功后仍遇到旧工作进程。前者改为先确认暂存已获得锁再模拟应答丢失；后者加强连续探测并增加回归测试，而非简单增加测试超时。旧程序和失败记录均保留。
+
+不同 UID 单元最初只设置能力边界，子进程在执行前报 `operation not permitted`；独立诊断确认有效能力中缺少 `CAP_SETUID`，`setpriv` 同样失败。显式设置所需环境能力后，同一测试程序通过，不将首次未进入校验逻辑的失败计为安全验证。
+
+### 仍需完成
+
+- [ ] 安装 socket/service、专用版本目录和目标站点 include；当前正式站点仍直接引用原证书文件。
+- [ ] 应用持久化双层协调与启动恢复、完整生命周期串行化、应答丢失及中断恢复；目前不能自动处理任意应用崩溃窗口。
+- [ ] 最新完整候选构建部署、管理证书续期闭环、目标机真实推送、通知送达、完整灾难恢复和容量验收。
+
+## 前序进展：Nginx 证书激活事务组件实机验证
 
 2026-09-18 01:45 至 02:03 本轮接续，修改前检查点 `10645ea` 已推送。本节为最新状态；本轮没有替换正式程序、重载正式 Nginx 或清空正式数据库，组件验证通过不代表完整生产验收完成。