ci: Add GitHub Actions workflow for build and test

Runs on:
- Push to main or develop
- PRs targeting main or develop

Pipeline:
- Restore, build, test with .NET 10
- Upload test results and coverage reports

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: randlee

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+          dotnet-quality: 'preview'
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --no-restore --configuration Release
+
+      - name: Test
+        run: dotnet test --no-build --configuration Release --verbosity normal --logger "trx;LogFileName=test-results.trx" --collect:"XPlat Code Coverage"
+
+      - name: Upload test results
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: test-results
+          path: "**/TestResults/**/*.trx"
+
+      - name: Upload coverage reports
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-reports
+          path: "**/TestResults/**/coverage.cobertura.xml"