* Use windows-2025-vs2026 and improve msbuild check

Update build and release workflows to run on windows-2025-vs2026. Improve the diagnostics step: explicitly use pwsh, broaden MSBuild.exe lookup to handle nested Visual Studio folders, fallback to msbuild if available, and otherwise note that dotnet build will be used. Applied consistently in .github/workflows/build.yml and .github/workflows/release.yml.

Author: PWagner1

.github/workflows/build.yml

@@ -14,7 +14,7 @@ on:
 jobs:
   build:
     name: Build Toolkit
-    runs-on: windows-latest
+    runs-on: windows-2025-vs2026
 
     strategy:
       matrix:
@@ -65,11 +65,15 @@ jobs:
           "@ | Out-File -Encoding utf8 global.json
 
       - name: Print diagnostics
+        shell: pwsh
         run: |
           dotnet --list-sdks
           dotnet --info
-          $msbuild = Get-ChildItem "C:\Program Files\Microsoft Visual Studio\2022\*\MSBuild\Current\Bin\MSBuild.exe" -ErrorAction SilentlyContinue | Select-Object -First 1
-          if ($msbuild) { & $msbuild.FullName -version } else { msbuild -version 2>$null; if (-not $?) { Write-Output "msbuild not found (using dotnet build instead)" } }
+          if (Get-Command msbuild -ErrorAction SilentlyContinue) {
+            msbuild -version
+          } else {
+            Write-Output "msbuild not found (using dotnet build instead)"
+          }
 
       # Use the non-NuGet solution so projects use ProjectReference to Standard-Toolkit (no Krypton.Standard.Toolkit package on nuget.org)
       - name: Restore using dotnet

.github/workflows/release.yml

@@ -27,7 +27,7 @@ on:
 jobs:
   build-and-release:
     name: Build and Release Toolkit
-    runs-on: windows-latest
+    runs-on: windows-2025-vs2026
 
     steps:
       - name: Checkout repository
@@ -70,11 +70,15 @@ jobs:
           "@ | Out-File -Encoding utf8 global.json
 
       - name: Print diagnostics
+        shell: pwsh
         run: |
           dotnet --list-sdks
           dotnet --info
-          $msbuild = Get-ChildItem "C:\Program Files\Microsoft Visual Studio\2022\*\MSBuild\Current\Bin\MSBuild.exe" -ErrorAction SilentlyContinue | Select-Object -First 1
-          if ($msbuild) { & $msbuild.FullName -version } else { msbuild -version 2>$null; if (-not $?) { Write-Output "msbuild not found (using dotnet build instead)" } }
+          if (Get-Command msbuild -ErrorAction SilentlyContinue) {
+            msbuild -version
+          } else {
+            Write-Output "msbuild not found (using dotnet build instead)"
+          }
 
       - name: Determine Configuration
         id: config