fix(notify): 根治低带宽控制面阻塞与传输写入卡死

- 为控制消息增加优先级、公平调度、队列字节预算和自适应批处理
- 支持可取消的写门等待，收紧 shared/dedicated bulk、stream 和 Reply 写入边界
- 修复 bulk reset/close、连接 handoff 和安全 profile 切换时序
- 保留旧取消与超时错误契约，新增阶段化 TransportSendError
- 增加 ReplyCtx、ReplyObjCtx、写超时配置及黑洞连接和竞态回归测试

stream.go

@@ -671,6 +671,21 @@ func (s *streamHandle) CloseWrite() error {
 	return s.close(false)
 }
 
+func (s *streamHandle) newControlContext() (context.Context, func(), error) {
+	if s == nil {
+		return nil, func() {}, io.ErrClosedPipe
+	}
+	s.mu.Lock()
+	parent := context.Background()
+	writeTimeout := s.writeTimeout
+	s.mu.Unlock()
+	ctx, cancel, _, err := s.newWriteContext(parent, writeTimeout)
+	if err != nil {
+		return nil, func() {}, err
+	}
+	return ctx, cancel, nil
+}
+
 func (s *streamHandle) close(full bool) error {
 	if s == nil {
 		return nil
@@ -692,7 +707,12 @@ func (s *streamHandle) close(full bool) error {
 		s.mu.Unlock()
 
 		if closeFn != nil {
-			if err := closeFn(context.Background(), s, true); err != nil && !errors.Is(err, errStreamNotFound) {
+			ctx, cancel, err := s.newControlContext()
+			if err != nil {
+				return err
+			}
+			defer cancel()
+			if err := closeFn(ctx, s, true); err != nil && !errors.Is(err, errStreamNotFound) {
 				return err
 			}
 		}
@@ -716,7 +736,12 @@ func (s *streamHandle) close(full bool) error {
 	s.mu.Unlock()
 
 	if closeFn != nil {
-		if err := closeFn(context.Background(), s, full); err != nil && !errors.Is(err, errStreamNotFound) {
+		ctx, cancel, err := s.newControlContext()
+		if err != nil {
+			return err
+		}
+		defer cancel()
+		if err := closeFn(ctx, s, full); err != nil && !errors.Is(err, errStreamNotFound) {
 			return err
 		}
 	}
@@ -758,7 +783,12 @@ func (s *streamHandle) Reset(err error) error {
 	s.mu.Unlock()
 
 	if resetFn != nil {
-		if sendErr := resetFn(context.Background(), s, streamResetMessage(resetErr)); sendErr != nil {
+		ctx, cancel, err := s.newControlContext()
+		if err != nil {
+			return err
+		}
+		defer cancel()
+		if sendErr := resetFn(ctx, s, streamResetMessage(resetErr)); sendErr != nil {
 			return sendErr
 		}
 	}