Handle missing mlx.metallib in CI pipeline

Author: KSemenenko

.github/workflows/ci.yml

@@ -172,9 +172,17 @@ jobs:
 
       - name: Stage native libraries in project
         run: |
+          set -euo pipefail
+
           mkdir -p src/MLXSharp/runtimes/osx-arm64/native
           cp artifacts/native/osx-arm64/libmlxsharp.dylib src/MLXSharp/runtimes/osx-arm64/native/
-          cp artifacts/native/osx-arm64/mlx.metallib src/MLXSharp/runtimes/osx-arm64/native/
+
+          if [ -f artifacts/native/osx-arm64/mlx.metallib ]; then
+            cp artifacts/native/osx-arm64/mlx.metallib src/MLXSharp/runtimes/osx-arm64/native/
+          else
+            echo "::warning::mlx.metallib not found in macOS native artifact; continuing without Metal shaders"
+          fi
+
           mkdir -p src/MLXSharp/runtimes/linux-x64/native
           cp artifacts/native/linux-x64/libmlxsharp.so src/MLXSharp/runtimes/linux-x64/native/
 
@@ -186,7 +194,12 @@ jobs:
           TEST_OUTPUT="src/MLXSharp.Tests/bin/Release/net9.0"
           mkdir -p "$TEST_OUTPUT/runtimes/osx-arm64/native"
           cp src/MLXSharp/runtimes/osx-arm64/native/libmlxsharp.dylib "$TEST_OUTPUT/runtimes/osx-arm64/native/"
-          cp src/MLXSharp/runtimes/osx-arm64/native/mlx.metallib "$TEST_OUTPUT/runtimes/osx-arm64/native/"
+
+          if [ -f src/MLXSharp/runtimes/osx-arm64/native/mlx.metallib ]; then
+            cp src/MLXSharp/runtimes/osx-arm64/native/mlx.metallib "$TEST_OUTPUT/runtimes/osx-arm64/native/"
+          else
+            echo "::warning::mlx.metallib not staged; tests will continue without Metal shaders"
+          fi
           ls -la "$TEST_OUTPUT/runtimes/osx-arm64/native/"
 
       - name: Run tests