Verify every NCD control ID byte and clarify new-socket scope

tests/test_etcp_server_lifecycle.c

@@ -37,6 +37,7 @@ static void owner_cb(struct NODE_CONN_DIRECT* handle, enum ncd_event event, void
 static void setup(void) {
     memset(&inst, 0, sizeof(inst)); memset(&cfg, 0, sizeof(cfg)); memset(&sock, 0, sizeof(sock));
     deleted = closed = down = 0; release_on_down = 0;
+    inst.node_id = UINT64_C(0x0123456789abcdef);
     inst.ua = uasync_create(); CHECK(inst.ua); inst.config = &cfg;
     cfg.global.bbr_max_cwnd = 100000; cfg.global.keepalive_interval = 200; cfg.global.keepalive_timeout = 2000;
     inst.connections = queue_new(inst.ua, 16, 0, 8, "server lifecycle"); CHECK(inst.connections);
@@ -87,6 +88,7 @@ static void receive_control(struct ETCP_CONN* conn, uint8_t subcmd) {
     struct ncd_control_msg msg = { ETCP_ID_NCD_CONTROL, subcmd, conn->peer_node_id };
     struct ll_entry* entry = ll_alloc_lldgram(sizeof(msg)); CHECK(entry);
     memcpy(entry->dgram, &msg, sizeof(msg)); entry->len = sizeof(msg);
+    for (unsigned i = 0; i < 8; i++) entry->dgram[2 + i] = (uint8_t)(conn->peer_node_id >> (8 * i));
     inst.api_bindings.callbacks[ETCP_ID_NCD_CONTROL](conn, entry);
     uasync_drain_immediate(inst.ua);
 }
@@ -303,13 +305,15 @@ static void check_peer_wake_reordered(void) {
 /* Мягкое закрытие работает без NCD entry; KEEP_ALIVE сохраняет транспорт дольше прежних 5 секунд. */
 static void check_graceful(void) {
     setup(); struct ETCP_CONN* conn = ready_conn(0);
+    conn->peer_node_id = UINT64_C(0xfedcba9876543210);
     receive_control(conn, NCD_SUBCMD_CLOSE); CHECK(deleted == 1 && !inst.connections->count); teardown();
     setup(); conn = ready_conn(0); struct NODE_CONN_DIRECT* handle = NULL;
     CHECK(node_conn_direct_open(&inst, 42, NULL, NULL, &handle, NULL) == NCD_REUSED);
     receive_control(conn, NCD_SUBCMD_CLOSE); CHECK(!deleted && !conn->fin_wait);
     CHECK(conn->send_input_q->count == 1);
     struct ncd_control_msg* response = (void*)conn->send_input_q->head->dgram;
-    CHECK(response->subcmd == NCD_SUBCMD_KEEP_ALIVE);
+    CHECK(conn->send_input_q->head->len == 10 && response->cmd == ETCP_ID_NCD_CONTROL && response->subcmd == NCD_SUBCMD_KEEP_ALIVE);
+    for (unsigned i = 0; i < 8; i++) CHECK(conn->send_input_q->head->dgram[2 + i] == (uint8_t)(inst.node_id >> (8 * i)));
     node_conn_direct_close(handle); CHECK(conn->fin_wait);
     receive_control(conn, NCD_SUBCMD_KEEP_ALIVE); CHECK(!conn->fin_wait);
     test_clock_run_for(inst.ua, 70000); CHECK(!deleted && conn->links_up);