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/io_file.c

@@ -150,7 +150,7 @@ static void KiIoAsyncFileWorker(void* arg) {
         }
 
         if (req->CancelRequested) {
-            // The operation may already have reached the filesystem.  The
+            // The operation may already have reached the filesystem. The
             // completion contract still reports cancellation so waiters/APCs do
             // not mistake a cancelled request for useful data.
             s = STATUS_CANCELLED;
@@ -628,7 +628,7 @@ __declspec(dllexport) KSTATUS IoOpenFile(SYS_STRING_VIEW path, FILE_OBJECT **out
 }
 
 // ---------------------------------------------------------------------------
-// Explicit-offset file I/O.  Async I/O is built on these routines so it does
+// Explicit-offset file I/O. Async I/O is built on these routines so it does
 // not race the sequential FILE_OBJECT.Offset used by legacy read/write calls.
 // ---------------------------------------------------------------------------
 __declspec(dllexport) KSTATUS IoReadFileAt(FILE_OBJECT* file, uint64_t offset,