feat: add Kotlin SDK JVM tests to GitHub Actions CI

- Move Kotlin SDK from kotlin-sdk to sdks/community/kotlin
- Add kotlin job to test.yml workflow to run 209 JVM tests
- Uses JDK 21 on ubuntu-latest with Gradle caching

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: contextablemark

.github/workflows/test.yml

@@ -89,4 +89,25 @@ jobs:
 
     - name: Run tests
       working-directory: typescript-sdk
-      run: pnpm run test
+      run: pnpm run test
+
+  kotlin:
+    name: Kotlin SDK Tests
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v3
+
+    - name: Run JVM tests
+      working-directory: sdks/community/kotlin/library
+      run: ./gradlew jvmTest --no-daemon --stacktrace