Fix: segfault in ETCP tests and add wintun.dll to gitignore

- Fix segfault in ETCP tests by initializing uECC RNG in sc_init_local_keys()
- Fix segfault during cleanup by adding reference counting to socket_platform_cleanup()
- Add wintun.dll to .gitignore
- Update AGENTS.md and platform compatibility headers

All 19 tests now pass successfully.

src/secure_channel.c

@@ -574,6 +574,9 @@ sc_status_t sc_init_local_keys(struct SC_MYKEYS *mykeys, const char *public_key,
         curve = uECC_secp256r1();
     }
 
+    /* Set RNG function for TinyCrypt - must be done before any ECC operations */
+    uECC_set_rng(sc_rng);
+
     DEBUG_INFO(DEBUG_CATEGORY_CRYPTO, "sc_init_local_keys: public_key len=%zu, private_key len=%zu", 
                strlen(public_key), strlen(private_key));
 

src/utun.conf

@@ -1,42 +0,0 @@
-[global]
-tun_ip=10.0.0.1
-mtu=1500  # MTU for all connections (0 = use default 1500)
-control_ip=127.0.0.1
-control_port=12345
-net_debug=0
-
-my_node_id=61be9d4cd3c60c2d
-my_private_key=1313912e5d34768983b0e06530a48c77816d228a5b5605e1ab3dc443d107a3dc
-my_public_key=
-
-
-[routing]
-route_subnet=10.0.0.0/24 
-route_subnet=10.22.0.0/16
-route_subnet=10.23.0.0/16
-my_subnet=10.23.5.0/24
-my_subnet=10.23.6.0/24
-
-# мои адреса и каналы
-[server: lo0_test]
-addr=127.0.0.1:1330
-#so_mark=100
-#netif=eth0
-type=nat # public / nat / private
-
-[server: lan1]
-addr=192.168.29.117:1333
-so_mark=100
-netif=eth0
-type=public # public / nat / private
-
-[client: client_test1]
-
-# линки
-link=lo0_test:192.168.0.20:1234
-#link=wired1_fast:1.2.3.4:1234
-link=lan1:192.168.0.20:1234
-#link=wireless_bkp:1.2.3.4:1234
-
-keepalive=1
-peer_public_key=deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbee