Add Windows platform support for terminal handling

[Copilot]

Windows CI build failing due to Unix-only headers (sys/ioctl.h, termios.h, unistd.h) that don't exist on Windows.

Changes

• terminal.h/cpp: Windows Console API implementation

  • GetConsoleMode/SetConsoleMode for raw mode
  • ReadConsoleInput for keyboard input with VK_* to ANSI escape sequence mapping
  • Enable ENABLE_VIRTUAL_TERMINAL_PROCESSING for ANSI support

• buffer.cpp: Replace ioctl(TIOCGWINSZ) with GetConsoleScreenBufferInfo() for terminal size

• history.cpp: Fallback to USERPROFILE env var on Windows when HOME unset

• readline.cpp: Guard kill(0, SIGSTOP) as Unix-only

All changes use #ifdef _WIN32 conditional compilation to preserve existing Unix behavior.

Original prompt

Fix this build:

2025-11-27T14:14:18.9654761Z ##[group]Run cmake --build build --config Release
2025-11-27T14:14:18.9655192Z �[36;1mcmake --build build --config Release�[0m
2025-11-27T14:14:18.9716930Z shell: C:\Program Files\PowerShell\7\pwsh.EXE -command ". '{0}'"
2025-11-27T14:14:18.9717262Z env:
2025-11-27T14:14:18.9717431Z CommandPromptType: Native
2025-11-27T14:14:18.9717775Z DevEnvDir: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE
2025-11-27T14:14:18.9718265Z ExtensionSdkDir: C:\Program Files (x86)\Microsoft SDKs\Windows Kits\10\ExtensionSDKs
2025-11-27T14:14:18.9789462Z EXTERNAL_INCLUDE: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ATLMFC\include;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\VS\include;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\um;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\shared;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\winrt;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\cppwinrt;C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um
2025-11-27T14:14:18.9793373Z Framework40Version: v4.0
2025-11-27T14:14:18.9793823Z FrameworkDir: C:\Windows\Microsoft.NET\Framework64
2025-11-27T14:14:18.9794373Z FrameworkDir64: C:\Windows\Microsoft.NET\Framework64
2025-11-27T14:14:18.9794858Z FrameworkVersion: v4.0.30319
2025-11-27T14:14:18.9795244Z FrameworkVersion64: v4.0.30319
2025-11-27T14:14:18.9796117Z FSHARPINSTALLDIR: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\CommonExtensions\Microsoft\FSharp\Tools
2025-11-27T14:14:18.9797104Z HTMLHelpDir: C:\Program Files (x86)\HTML Help Workshop
2025-11-27T14:14:18.9797879Z IFCPATH: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ifc\x64
2025-11-27T14:14:18.9801459Z INCLUDE: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ATLMFC\include;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\VS\include;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\um;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\shared;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\winrt;C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\cppwinrt;C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um
2025-11-27T14:14:18.9804944Z is_x64_arch: true
2025-11-27T14:14:18.9806910Z LIB: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ATLMFC\lib\x64;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\lib\x64;C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\lib\um\x64;C:\Program Files (x86)\Windows Kits\10\lib\10.0.26100.0\ucrt\x64;C:\Program Files (x86)\Windows Kits\10\lib\10.0.26100.0\um\x64
2025-11-27T14:14:18.9811263Z LIBPATH: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ATLMFC\lib\x64;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\lib\x64;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\lib\x86\store\references;C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.26100.0;C:\Program Files (x86)\Windows Kits\10\References\10.0.26100.0;C:\Windows\Microsoft.NET\Framework64\v4.0.30319
2025-11-27T14:14:18.9814558Z NETFXSDKDir: C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8
2025-11-27T14:14:18.9831284Z Path: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\bin\HostX64\x64;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\VC\VCPackages;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TestWindow;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Current\bin\Roslyn;C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools\x64;C:\Program Files (x86)\HTML Help Workshop;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\CommonExtensions\Microsoft\FSharp\Tools;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Team Tools\DiagnosticsHub\Collector;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\Extensions\Microsoft\CodeCoverage.Console;C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\Llvm\x64\bin;C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x64;C:\Program Files (x86)\Windows Kits\10\bin\x64;C:\Program Files\Microsoft Visual Stu...

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