Commit MIDI Services nupkg to repo, revert CI download workaround

Add gitignore exception for nuget-local/*.nupkg so the Windows MIDI
Services package is tracked in git. Remove the curl download step
from the CI workflow since the package is now in the repo.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: hifihedgehog

.github/workflows/build.yml

@@ -28,13 +28,6 @@ jobs:
         with:
           dotnet-version: 10.x
 
-      - name: Restore local NuGet packages
-        shell: bash
-        run: |
-          mkdir -p nuget-local
-          curl -sL -o nuget-local/Microsoft.Windows.Devices.Midi2.1.0.16-rc.3.7.nupkg \
-            https://github.com/microsoft/MIDI/releases/download/rc-3/Microsoft.Windows.Devices.Midi2.1.0.16-rc.3.7.nupkg
-
       - name: Publish
         run: dotnet publish PadForge.App/PadForge.App.csproj -c Release
 

.gitignore

@@ -38,6 +38,7 @@ bld/
 **/[Pp]ackages/*
 !**/[Pp]ackages/build/
 *.nupkg
+!nuget-local/*.nupkg
 **/packages/repositories.config
 project.lock.json
 project.fragment.lock.json