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_dpc.c

@@ -46,7 +46,7 @@ __declspec(dllexport) bool KeInsertQueueDpc(KDPC* dpc,
 
     KiEnsureDpcInitialized();
 
-    // Coalesce repeated inserts of the same KDPC.  The first insert owns the
+    // Coalesce repeated inserts of the same KDPC. The first insert owns the
     // argument pair until the DPC is popped by the dispatcher.
     if (_InterlockedCompareExchange(&dpc->Inserted, 1, 0) != 0)
         return false;