fix(notify): 修复传输生命周期竞态，完善背压与协议边界

- 完善 stream/bulk DataID 分配、预留和双向命名空间，修复并发打开及 dedicated/shared 回退时的 ID 冲突
- 将收发、回复、恢复任务和 sidecar 绑定原始会话与物理连接，防止重连后的旧消息误操作新连接
- 加强 close/reset 身份校验及实例移除检查，修复 dedicated attach 失败、通道引用和资源回收竞态
- 收紧批量发送器停止准入，确保在途入队完成后统一清理请求、缓冲区和等待者
- 修复 record 满队列死锁、取消时序号消耗及关闭竞态，确保关闭有界并返回真实错误
- 增加协商式 record 逻辑半关闭，保留反向 ACK；通过 reset 传递 RecordFailure，避免背压掩盖原始失败原因
- 补齐帧长度、批次数量、序号溢出和未确认窗口校验，提前拒绝超限数据并按字节预算拆批
- 为入站分发增加全局及单连接的条数、字节预算和阻塞背压，关闭时唤醒等待者，消除正常断连日志噪音
- 完善 bulk 窗口释放失败处理与传输诊断，补充并发、重连、背压、协议边界及真实 TCP 回归覆盖

bulk_shared_batch_test.go

@@ -2,10 +2,42 @@ package notify
 
 import (
 	"context"
+	"errors"
+	"sync/atomic"
 	"testing"
 	"time"
 )
 
+func TestBulkBatchSenderEncodeRequestsReleasesPayloadsOnError(t *testing.T) {
+	if !bulkFastPathSupportsSharedBatch(bulkFastPathVersionV2) {
+		t.Fatal("v2 should support shared batch")
+	}
+	var released atomic.Int32
+	sender := &bulkBatchSender{
+		codec: bulkBatchCodec{
+			encodeSingle: func(frame bulkFastFrame) ([]byte, func(), error) {
+				return nil, nil, errors.New("single encode failed")
+			},
+			encodeBatch: func(frames []bulkFastFrame) ([]byte, func(), error) {
+				return []byte("batch"), func() { released.Add(1) }, nil
+			},
+		},
+	}
+	_, err := sender.encodeRequests([]bulkBatchRequest{
+		{frames: []bulkFastFrame{
+			{Type: bulkFastPayloadTypeData, DataID: 1, Payload: []byte("a")},
+			{Type: bulkFastPayloadTypeData, DataID: 1, Payload: []byte("a2")},
+		}, fastPathVersion: bulkFastPathVersionV2},
+		{frames: []bulkFastFrame{{Type: bulkFastPayloadTypeData, DataID: 1, Payload: []byte("b")}}, fastPathVersion: 1},
+	})
+	if err == nil {
+		t.Fatal("encodeRequests unexpectedly succeeded")
+	}
+	if got := released.Load(); got != 1 {
+		t.Fatalf("released payloads = %d, want 1", got)
+	}
+}
+
 func TestBulkFastBatchPlainRoundTrip(t *testing.T) {
 	releasePayload, err := encodeBulkDedicatedReleasePayload(4096, 2)
 	if err != nil {