move keyboard and mouse out of HAL into a standalone ps2.sys driver, implement usb stack with xhci controller discovery, hid keyboard/mouse, and bulk-only mass storage, add pci msi support with capability chain walking and software irq vector allocation (slots 16-23), rewrite user virtual memory as a USER_VA_REGION descriptor arena with per-process ownership tracking and guard page support, replacing the old bump allocator and top-down image region, add MmCreateUserRegion/MmDestroyAllUserRegions so process teardown reclaims all user va in one pass, allocate a pool-backed shadow framebuffer in hal_screen to fix cursor tearing and scroll corruption, reserve ap trampoline page below 1mb in uefi bootloader before boot services exit, rewrite memset/memcpy/memmove/memcmp with __stosq/__movsq intrinsics, promote driver flag literals to macros and add multi-tu STANDALONE_DRIVERS table to build.c, split rtl8139/rtl816x into header+source, rename KbReadScancode to KbReadKey, improve page fault output with MmDebugDescribeAddress and user region dump, fix %p to %016llX throughout.

code/public/ntlite/ddi/input_device.h

@@ -0,0 +1,9 @@
+#pragma once
+// input_device.h - driver-facing input submission DDI.
+
+#include <ntlite/input.h>
+#include <ntlite/status.h>
+
+__declspec(dllexport) KSTATUS KeInputRegisterDevice(const char* name, uint32_t flags, uint32_t* outDeviceId);
+__declspec(dllexport) void KeInputSubmitKey(const INPUT_KEY_EVENT* event);
+__declspec(dllexport) void KeInputSubmitMouse(const INPUT_MOUSE_EVENT* event);