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/kernel/ke_semaphore.c

@@ -57,7 +57,7 @@ __declspec(dllexport) void KeSignalSemaphore(SEMAPHORE* sem) {
     if (!sem) return;
     uintptr_t flags = KeAcquireSpinlock(&sem->Lock);
     if (!LIST_IS_EMPTY(&sem->WaitList)) {
-        // Transfer this semaphore release directly to the selected waiter.  The
+        // Transfer this semaphore release directly to the selected waiter. The
         // count stays unchanged; the waiter returns success without looping and
         // consuming a count later.
         LIST_ENTRY* node = ListPopHead(&sem->WaitList);