release(v2.0.0): cross-platform release — Linux/macOS/Windows/WSL

Creates full release package with:
- release/install.sh (universal cross-platform installer)
- release/windows/install.bat (Git Bash/MSYS2)
- release/windows/install.ps1 (PowerShell)
- release/homebrew/gyandoot.rb (Homebrew formula)
- release/archives/ prebuilt binary archives
- release/README.md (platform-specific install guide)
- install.sh updated with same cross-platform logic
- README.md updated

release/windows/install.bat

@@ -0,0 +1,121 @@
+@echo off
+REM ═══════════════════════════════════════════════════════════════════════════
+REM  GyanDoot v2.0 — Windows Installer (Git Bash / MSYS2)
+REM ═══════════════════════════════════════════════════════════════════════════
+REM  This script installs GyanDoot on Windows via Git Bash or MSYS2.
+REM  For PowerShell, use: install.ps1
+REM ═══════════════════════════════════════════════════════════════════════════
+
+setlocal enabledelayedexpansion
+
+echo.
+echo  ╔═══════════════════════════════════════╗
+echo  ║   GyanDoot v2.0 — Windows Installer   ║
+echo  ╚═══════════════════════════════════════╝
+echo.
+
+REM ── Check if running in Git Bash / MSYS2 ──────────────────────────────
+if not defined MSYSTEM (
+    echo [WARN] This script requires Git Bash or MSYS2.
+    echo        For PowerShell, use: install.ps1
+    echo.
+    echo        Or download from: https://git.gyannetra.in/gnpl_admin/gyandoot-release
+    pause
+    exit /b 1
+)
+
+REM ── Check prerequisites ───────────────────────────────────────────────
+echo [CHECK] Rust...
+where cargo >nul 2>&1
+if errorlevel 1 (
+    echo [INFO] Rust not found. Installing Rust...
+    powershell -Command "& {Invoke-WebRequest -Uri https://win.rustup.rs -OutFile '%TEMP%\rustup-init.exe'; Start-Process '%TEMP%\rustup-init.exe' -Wait -ArgumentList '-y'}"
+    call "%USERPROFILE%\.cargo\env"
+    echo [OK] Rust installed
+) else (
+    for /f "tokens=*" %%i in ('cargo --version') do echo [OK] %%i
+)
+
+echo [CHECK] Node.js...
+where node >nul 2>&1
+if errorlevel 1 (
+    echo [WARN] Node.js is required for browser features.
+    echo        Download from: https://nodejs.org (v20+)
+    echo        Or: winget install OpenJS.NodeJS
+) else (
+    for /f "tokens=*" %%i in ('node --version') do echo [OK] Node.js %%i
+)
+
+REM ── Build ──────────────────────────────────────────────────────────────
+echo.
+echo [BUILD] Compiling GyanDoot (this may take a few minutes)...
+cd /d "%~dp0.." 2>nul || (
+    echo [ERR] Could not find project root.
+    echo       Make sure you're running this from the release directory.
+    pause
+    exit /b 1
+)
+
+cargo build --release
+if errorlevel 1 (
+    echo [ERR] Build failed. Check the error above.
+    pause
+    exit /b 1
+)
+
+echo [OK] Build complete
+
+REM ── Install binary ────────────────────────────────────────────────────
+set "INSTALL_DIR=%USERPROFILE%\.cargo\bin"
+if not exist "%INSTALL_DIR%" mkdir "%INSTALL_DIR%"
+
+copy /Y "target\release\gyandoot.exe" "%INSTALL_DIR%\gyandoot.exe" >nul
+echo [OK] Installed to %INSTALL_DIR%\gyandoot.exe
+
+REM ── Check PATH ────────────────────────────────────────────────────────
+echo !PATH! | findstr /C:"%USERPROFILE%\.cargo\bin" >nul
+if errorlevel 1 (
+    echo [WARN] %USERPROFILE%\.cargo\bin is not in your PATH.
+    echo        Add it manually to your PATH environment variable.
+    echo        Or run: setx PATH "%%USERPROFILE%%\.cargo\bin;%%PATH%%"
+    echo.
+    echo        Then restart your terminal.
+)
+
+REM ── Verify ────────────────────────────────────────────────────────────
+echo.
+echo [VERIFY] Checking installation...
+"%INSTALL_DIR%\gyandoot.exe" --help >nul 2>&1
+if errorlevel 1 (
+    echo [WARN] Installation verification failed.
+) else (
+    echo [OK] GyanDoot installed successfully!
+)
+
+REM ── Optional: Camoufox browser ────────────────────────────────────────
+echo.
+echo ────────────────────────────────────────────
+echo  Optional: Install Camoufox Browser?
+echo  Required for: web_search, web_browse tools
+echo ────────────────────────────────────────────
+set /p INSTALL_CAMOUFOX="Install Camoufox browser? [y/N]: "
+if /i "!INSTALL_CAMOUFOX!"=="y" (
+    echo [INFO] Installing camoufox-browser npm package...
+    npm install -g camoufox-browser@0.1.0
+    echo [INFO] Downloading browser binary (~311MB)...
+    npx --yes camoufox-js@0.11.0 fetch
+    echo [OK] Camoufox browser installed
+)
+
+REM ── Done ──────────────────────────────────────────────────────────────
+echo.
+echo ╔═══════════════════════════════════════╗
+echo ║   GyanDoot v2.0 installed!            ║
+echo ╚═══════════════════════════════════════╝
+echo.
+echo   Quick start:
+echo     gyandoot --help
+echo     gyandoot setup
+echo     gyandoot run
+echo.
+pause