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

transport_binding_adaptive_test.go

@@ -7,6 +7,33 @@ import (
 	"time"
 )
 
+func TestTransportBindingAdaptiveControlStartsLANFriendly(t *testing.T) {
+	binding := &transportBinding{}
+	if got, want := binding.controlAdaptiveSoftPayloadBytesSnapshot(), controlAdaptiveSoftPayloadStartBytes; got != want {
+		t.Fatalf("adaptive control soft payload = %d, want %d", got, want)
+	}
+}
+
+func TestTransportBindingAdaptiveControlShrinksAfterSlowWrite(t *testing.T) {
+	binding := &transportBinding{}
+	binding.observeControlAdaptivePayloadWrite(4*1024*1024, 4*time.Second, 30*time.Second, nil)
+	if got, want := binding.controlAdaptiveSoftPayloadBytesSnapshot(), controlAdaptiveSoftPayloadMinBytes; got != want {
+		t.Fatalf("adaptive control soft payload = %d, want %d", got, want)
+	}
+}
+
+func TestTransportBindingAdaptiveControlRecoversAfterFastWrites(t *testing.T) {
+	binding := &transportBinding{}
+	binding.observeControlAdaptivePayloadWrite(4*1024*1024, 4*time.Second, 30*time.Second, nil)
+	samples := controlAdaptiveSoftPayloadGrowSuccesses * (len(controlAdaptiveSoftPayloadSteps) - 1)
+	for i := 0; i < samples; i++ {
+		binding.observeControlAdaptivePayloadWrite(4*1024*1024, 2*time.Millisecond, 30*time.Second, nil)
+	}
+	if got, want := binding.controlAdaptiveSoftPayloadBytesSnapshot(), controlAdaptiveSoftPayloadMaxBytes; got != want {
+		t.Fatalf("adaptive control soft payload = %d, want %d", got, want)
+	}
+}
+
 func TestTransportBindingAdaptiveBulkSoftPayloadStartsAggressive(t *testing.T) {
 	binding := &transportBinding{}
 	if got, want := binding.bulkAdaptiveSoftPayloadBytesSnapshot(), bulkAdaptiveSoftPayloadStartBytes; got != want {