add lwIP TCP/IP stack as a runtime driver, native socket syscalls, SysGetMemoryStatus replacing CatchAllDebugBucket, fix timeGetTime to return milliseconds, fix SysSleep to interpret argument as milliseconds, SysGetTick now returns microseconds, harden all syscalls against bad user pointers with CopyFromUser/CopyToUser/MmProbeUser throughout, add networking test apps, port-forward 8080 in runa.bat, split LWIP_DRIVER_CFLAGS, add settings.ini to deploy, remove ethernet.c stub

code/kernel/net_abi.h

@@ -0,0 +1,45 @@
+#pragma once
+// net_abi.h - native networking ABI shared by the kernel socket facade
+// and network stack provider drivers.
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define SYS_AF_INET         2u
+#define SYS_SOCK_STREAM     1u
+#define SYS_SOCK_DGRAM      2u
+#define SYS_SOCK_RAW        3u
+#define SYS_IPPROTO_ICMP    1u
+#define SYS_IPPROTO_TCP     6u
+#define SYS_IPPROTO_UDP     17u
+
+#define SYS_SHUTDOWN_READ   0u
+#define SYS_SHUTDOWN_WRITE  1u
+#define SYS_SHUTDOWN_BOTH   2u
+
+#define SYS_SOCKET_ADDRESS_IPV4_SIZE 16u
+#define SYS_RESOLVE_HOST_NAME_MAX 255u
+
+#define SYS_SOCKET_OPT_RECV_TIMEOUT_MS 1u
+#define SYS_SOCKET_OPT_SEND_TIMEOUT_MS 2u
+#define SYS_SOCKET_OPT_NONBLOCKING     3u
+
+#define SYS_POLL_READ     0x0001u
+#define SYS_POLL_WRITE    0x0002u
+#define SYS_POLL_ERROR    0x0004u
+#define SYS_POLL_HANGUP   0x0008u
+#define SYS_POLL_INVALID  0x0010u
+#define SYS_POLL_TIMEOUT_INFINITE 0xFFFFFFFFu
+
+typedef struct SYS_SOCKET_ADDRESS_IPV4_K {
+    uint16_t Family;       // SYS_AF_INET
+    uint16_t Port;         // host byte order
+    uint8_t  Address[4];   // dotted-quad bytes, e.g. {10,0,2,2}
+    uint8_t  Reserved[8];
+} SYS_SOCKET_ADDRESS_IPV4_K;
+
+typedef struct SYS_POLLFD_K {
+    uint32_t Handle;
+    uint32_t Events;
+    uint32_t ReturnedEvents;
+} SYS_POLLFD_K;