feat: kernel memory plugin + unified source menu + driver improvements

- KernelMemory plugin: kernel-mode process/physical memory R/W via IOCTL driver
- rcxdrv.sys: MmCopyMemory for reads, MDL mapping with correct cache types
  (MmCached for RAM, MmNonCached for MMIO only — fixes cache corruption BSOD)
- Driver reconnect: ensureDriverLoaded tries device handle first, no auto
  stop+delete cycle. Manual unload closes handle only, service stays running.
- Unified source menu: ProviderRegistry::populateSourceMenu() shared by both
  main window Data Source menu and RcxEditor inline picker (icons + dll names)
- IProviderPlugin::populatePluginMenu() for conditional plugin actions
  (e.g. "Unload Kernel Driver" only when loaded)
- Physical memory mode removed from selectTarget (access via context menu only)
- requestOpenProviderTab sets base address from provider after template load
- Address parser: vtop(), cr3(), physRead() callbacks for kernel paging expressions

plugins/KernelMemory/driver/build_driver.bat

@@ -0,0 +1,56 @@
+@echo off
+setlocal
+
+set MSVC=C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.39.33519
+set WDK=C:\Program Files (x86)\Windows Kits\10
+set WDKVER=10.0.22621.0
+
+set CL_EXE=%MSVC%\bin\Hostx64\x64\cl.exe
+set LINK_EXE=%MSVC%\bin\Hostx64\x64\link.exe
+
+set SRCDIR=%~dp0
+set OUTDIR=%SRCDIR%build
+
+if not exist "%OUTDIR%" mkdir "%OUTDIR%"
+
+echo === Compiling rcxdrv.c ===
+"%CL_EXE%" /nologo /c /Zi /W4 /WX- /O2 /GS- ^
+  /D "NDEBUG" /D "_AMD64_" /D "AMD64" /D "_WIN64" /D "KERNEL" ^
+  /D "NTDDI_VERSION=0x0A000000" ^
+  /I "%WDK%\Include\%WDKVER%\km" ^
+  /I "%WDK%\Include\%WDKVER%\km\crt" ^
+  /I "%WDK%\Include\%WDKVER%\shared" ^
+  /kernel ^
+  /Fo"%OUTDIR%\rcxdrv.obj" ^
+  "%SRCDIR%rcxdrv.c"
+if errorlevel 1 goto :fail
+
+echo === Linking rcxdrv.sys ===
+"%LINK_EXE%" /nologo ^
+  /OUT:"%OUTDIR%\rcxdrv.sys" ^
+  /DRIVER:WDM ^
+  /SUBSYSTEM:NATIVE ^
+  /ENTRY:DriverEntry ^
+  /MACHINE:X64 ^
+  /NODEFAULTLIB ^
+  /RELEASE ^
+  /MERGE:.rdata=.text ^
+  /INTEGRITYCHECK ^
+  /PDBALTPATH:rcxdrv.pdb ^
+  /PDB:"%OUTDIR%\rcxdrv.pdb" ^
+  "%OUTDIR%\rcxdrv.obj" ^
+  "%WDK%\Lib\%WDKVER%\km\x64\ntoskrnl.lib" ^
+  "%WDK%\Lib\%WDKVER%\km\x64\hal.lib" ^
+  "%WDK%\Lib\%WDKVER%\km\x64\BufferOverflowK.lib" ^
+  "%MSVC%\lib\x64\libcmt.lib"
+if errorlevel 1 goto :fail
+
+echo.
+echo === SUCCESS ===
+echo Output: %OUTDIR%\rcxdrv.sys
+goto :eof
+
+:fail
+echo.
+echo === BUILD FAILED ===
+exit /b 1