Rebuild the Unity CultMath DLL without Source Link, non-incrementally

The previous commit's DLL and pdb came from an incremental build that did
not recompile after the Source Link switch, so the pdb still carried the
commit URL. The script now builds with --no-incremental, so a stale obj
directory cannot decide what the byte check compares.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/cultmath/scripts/build-unity-package.ps1

@@ -29,7 +29,7 @@ if (Test-Path -LiteralPath $outputRoot) {
 
 # The tracked DLL and pdb are committed beside their source, so neither may name a commit: Source Link
 # writes the commit SHA into the pdb, and the DLL carries that pdb's content id.
-dotnet build $projectPath -c $Configuration -f netstandard2.1 -o $buildRoot `
+dotnet build $projectPath -c $Configuration -f netstandard2.1 -o $buildRoot --no-incremental `
   --disable-build-servers -p:UseSharedCompilation=false -p:ContinuousIntegrationBuild=true -p:EnableSourceLink=false -m:1
 if ($LASTEXITCODE -ne 0) {
   throw "CultMath Unity assembly build failed with exit code $LASTEXITCODE"