Add Windows build scripts, fix multi-threaded MPQ extraction, and cross-platform temp paths

- Add build.ps1/bat, rebuild.ps1/bat, debug_texture.ps1/bat (Windows equivalents
  of existing bash scripts, using directory junctions for Data link)
- Fix asset extractor: StormLib is not thread-safe even with separate handles per
  thread. Serialize all MPQ reads behind a mutex while keeping CRC computation and
  disk writes parallel. Previously caused 99.8% extraction failures with >1 thread.
- Add SFileHasFile() check during enumeration to skip listfile-only entries
- Add diagnostic logging for extraction failures (first 5 per thread + summary)
- Use std::filesystem::temp_directory_path() instead of hardcoded /tmp/ in
  character_renderer.cpp debug dumps
- Update debug_texture.sh to use $TMPDIR fallback and glob for actual dump filenames

build.ps1

@@ -0,0 +1,44 @@
+<#
+.SYNOPSIS
+    Builds the wowee project (Windows equivalent of build.sh).
+
+.DESCRIPTION
+    Creates a build directory, runs CMake configure + build, and creates a
+    directory junction for the Data folder so the binary can find assets.
+#>
+
+$ErrorActionPreference = "Stop"
+
+$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $ScriptDir
+
+Write-Host "Building wowee..."
+
+# Create build directory if it doesn't exist
+if (-not (Test-Path "build")) {
+    New-Item -ItemType Directory -Path "build" | Out-Null
+}
+Set-Location "build"
+
+# Configure with CMake
+Write-Host "Configuring with CMake..."
+& cmake .. -DCMAKE_BUILD_TYPE=Release
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+# Build with all cores
+$numProcs = $env:NUMBER_OF_PROCESSORS
+if (-not $numProcs) { $numProcs = 4 }
+Write-Host "Building with $numProcs cores..."
+& cmake --build . --parallel $numProcs
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+# Ensure Data junction exists in bin directory
+$binData = Join-Path (Get-Location) "bin\Data"
+if (-not (Test-Path $binData)) {
+    $target = (Resolve-Path (Join-Path (Get-Location) "..\Data")).Path
+    cmd /c mklink /J "$binData" "$target"
+}
+
+Write-Host ""
+Write-Host "Build complete! Binary: build\bin\wowee.exe"
+Write-Host "Run with: cd build\bin && .\wowee.exe"