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/user/personalities/posix/posix_thread.c

@@ -50,7 +50,7 @@ static void PthreadTrampoline(uintptr_t raw) {
     uint32_t pid       = tr->Pid;
     uint32_t tid       = SysGetCurrentTid();
 
-    // Create the join slot from inside the new thread.  KeCreateThread makes the
+    // Create the join slot from inside the new thread. KeCreateThread makes the
     // thread runnable before the creator regains control, so the old design
     // raced on tr->Tid and could observe zero/stale memory.
     PTHREAD_SLOT* slot = PthreadSlotFind(pid, tid);