feat(render): implement Campaign AR and terrain fidelity

tools/compile-shaders.ps1

@@ -36,6 +36,12 @@
     Use glslc when available. On by default; pass -PreferSdk:$false to force the
     managed path, which is what a comparison between the two wants.
 
+.PARAMETER ForceRecompile
+    Recompile even when the existing manifest proves that a source and its
+    committed SPIR-V artifact are unchanged. Use this only when validating a
+    compiler/toolchain change; ordinary regeneration preserves exact retail
+    binaries while compiling every changed shader.
+
 .EXAMPLE
     tools/compile-shaders.ps1
 #>
@@ -43,7 +49,8 @@
 param(
     [string]$ShadersDirectory,
     [string]$OutputDirectory,
-    [bool]$PreferSdk = $true
+    [bool]$PreferSdk = $true,
+    [switch]$ForceRecompile
 )
 
 $ErrorActionPreference = 'Stop'
@@ -149,7 +156,9 @@ if (-not (Test-Path $native)) {
 Write-Step "shaderc native: $native"
 
 Write-Step "compiling $ShadersDirectory -> $OutputDirectory"
-& dotnet $binary $ShadersDirectory $OutputDirectory
+$compilerArguments = @($binary, $ShadersDirectory, $OutputDirectory)
+if ($ForceRecompile) { $compilerArguments += '--force' }
+& dotnet @compilerArguments
 if ($LASTEXITCODE -ne 0) { throw "Shader compilation failed with exit code $LASTEXITCODE." }
 
 Write-Step 'done'