fix(hle): enable GuestImageWriteTracker CPU sync on Windows (#550)

Windows previously hard-disabled the tracker, so CPU-written guest
planes never marked dirty and host textures stayed empty. Arm pages
with VirtualProtect, handle write AVs in VEH, and warm/test on
VirtualAlloc memory so protect cannot poison the CRT heap.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.Imports.cs

@@ -69,6 +69,15 @@ public sealed partial class DirectExecutionBackend
 
 	private unsafe static int RawVectoredHandlerManaged(void* exceptionInfo)
 	{
+		EXCEPTION_RECORD* exceptionRecord = ((EXCEPTION_POINTERS*)exceptionInfo)->ExceptionRecord;
+		if (exceptionRecord->ExceptionCode == 3221225477u &&
+			exceptionRecord->NumberParameters >= 2 &&
+			SharpEmu.HLE.GuestImageWriteTracker.TryHandleWriteFault(
+				exceptionRecord->ExceptionInformation[1]))
+		{
+			return -1;
+		}
+
 		return TryRecoverUnresolvedSentinel(exceptionInfo);
 	}