Replace Maven workflow with Gradle build workflow

.github/workflows/build.yml

@@ -0,0 +1,49 @@
+# This workflow will build a Java project with Gradle and run tests
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-gradle
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ "master", "claude/**" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+
+    - name: Build with Gradle
+      run: ./gradlew build --no-daemon --stacktrace
+
+    - name: Run tests
+      run: ./gradlew test --no-daemon --stacktrace
+
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v3
+      with:
+        name: test-results
+        path: build/test-results/test/
+
+    - name: Upload build artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: build-libs
+        path: build/libs/*.jar