Implement core diagnostic memory layer, execution helpers, and high-level facade slices

Implemented:
- Core: UTF-16 ReadString boundary/alignment fix, target bitness and process id on MemoryBase
- function interception: PatchManager, DetourManager, InstructionAnalyzer, MainThreadDispatcher
- Execution: BackgroundTaskExecutor, InProcessInvoker
- High-level: Magic facade, RemotePointer, async wrappers
- Discovery/external code loading/Window groundwork (PEB/TEB, pattern scanning, raw allocations, DLL external code loading, window/input)

Tests: 180 passing, 4 integration/interactive tests skipped.

WhiteMagicTest/MemoryHardeningTests.cs

@@ -160,6 +160,8 @@ public class MemoryHardeningTests
     {
         public override IntPtr ImageBase => IntPtr.Zero;
         public override SafeMemoryHandle Handle => null!;
+        public override bool Is64Bit => Environment.Is64BitProcess;
+        public override int ProcessId => Environment.ProcessId;
 
         public override byte[] ReadBytes(IntPtr address, int count, bool isRelative = false)
         {