add: local code formatting script for Windows

Amp-Thread-ID: https://ampcode.com/threads/T-019c2688-afaf-76f5-b318-15265247ba46
Co-authored-by: Amp <amp@ampcode.com>

scripts/format-code.ps1

@@ -0,0 +1,30 @@
+# Format all C++ source files with clang-format
+# Run this before committing to avoid CI failures
+
+$ErrorActionPreference = "Stop"
+
+# Check if clang-format is installed
+$clangFormat = Get-Command clang-format -ErrorAction SilentlyContinue
+if (-not $clangFormat) {
+    Write-Host "clang-format not found. Installing via winget..." -ForegroundColor Yellow
+    winget install LLVM.LLVM
+    Write-Host "Please restart PowerShell and run this script again." -ForegroundColor Yellow
+    exit 1
+}
+
+# Find all source files
+$srcPath = Join-Path $PSScriptRoot "..\src"
+$files = Get-ChildItem -Path $srcPath -Recurse -Include "*.h", "*.c", "*.cpp" |
+    Where-Object { 
+        $_.FullName -notmatch "spatialmedia" -and 
+        $_.Name -ne "defaultlayouts.h" -and
+        $_.FullName -notmatch "_autogen"
+    }
+
+Write-Host "Formatting $($files.Count) files..." -ForegroundColor Cyan
+
+foreach ($file in $files) {
+    clang-format -style=file -i $file.FullName
+}
+
+Write-Host "Done! All files formatted." -ForegroundColor Green