fix: Build updates

Author: tmathern

.github/workflows/build-wheel.yml

@@ -135,8 +135,17 @@ jobs:
           pip install wheel
           pip install twine
 
-          # Download native artifacts
-          python scripts/download_artifacts.py $C2PA_VERSION
+          # Download native artifacts for the target architecture
+          if [ "${{ inputs.architecture }}" = "universal2" ]; then
+            python scripts/download_artifacts.py $C2PA_VERSION universal2
+          elif [ "${{ inputs.architecture }}" = "arm64" ]; then
+            python scripts/download_artifacts.py $C2PA_VERSION arm64
+          elif [ "${{ inputs.architecture }}" = "x86_64" ]; then
+            python scripts/download_artifacts.py $C2PA_VERSION x86_64
+          else
+            echo "Unknown architecture: ${{ inputs.architecture }}"
+            exit 1
+          fi
 
           # Determine platform name based on target architecture
           if [ "${{ inputs.architecture }}" = "universal2" ]; then

src/c2pa/lib.py

@@ -44,6 +44,7 @@ def get_platform_identifier() -> str:
 
     if system == "darwin":
         # Prefer specific architecture over universal for better performance
+        # Universal libraries will be attempted as fallback if specific ones aren't found
         current_arch = _get_architecture()
         if current_arch == CPUArchitecture.ARM64.value:
             return "aarch64-apple-darwin"
@@ -184,6 +185,11 @@ def _get_possible_search_paths() -> list[Path]:
         # Add platform identifier subfolder
         possible_paths.append(base_path / platform_id)
 
+    # Add universal fallback for macOS if we're not already looking for universal
+    if sys.platform == "darwin" and platform_id != "universal-apple-darwin":
+        for base_path in base_paths:
+            possible_paths.append(base_path / "universal-apple-darwin")
+
     # Add system library paths
     possible_paths.extend([Path(p) for p in os.environ.get(
         "LD_LIBRARY_PATH", "").split(os.pathsep) if p])