fix: configure CMake paths in pyproject.toml for proper Homebrew detection

- Add CMAKE_PREFIX_PATH and OpenMP_ROOT environment variable mapping in both backends
- Remove CMAKE_ARGS from GitHub Actions workflow (cleaner separation)
- Ensure scikit-build-core correctly uses environment variables for CMake configuration
- This should fix the hardcoded /opt/homebrew paths on Intel Macs

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

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/build-reusable.yml

@@ -150,8 +150,6 @@ jobs:
             export CC=clang
             export CXX=clang++
             export MACOSX_DEPLOYMENT_TARGET=11.0
-            # Pass CMAKE_PREFIX_PATH to help CMake find Homebrew packages
-            export CMAKE_ARGS="-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH} -DOpenMP_ROOT=${OpenMP_ROOT}"
             uv build --wheel --python python
           else
             uv build --wheel --python python
@@ -166,8 +164,6 @@ jobs:
             export CXX=clang++
             # DiskANN requires macOS 13.3+ for sgesdd_ LAPACK function
             export MACOSX_DEPLOYMENT_TARGET=13.3
-            # Pass CMAKE_PREFIX_PATH to help CMake find Homebrew packages
-            export CMAKE_ARGS="-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH} -DOpenMP_ROOT=${OpenMP_ROOT}"
             uv build --wheel --python python
           else
             uv build --wheel --python python

packages/leann-backend-diskann/pyproject.toml

@@ -17,3 +17,5 @@ editable.mode = "redirect"
 cmake.build-type = "Release"
 build.verbose = true
 build.tool-args = ["-j8"]
+# Let CMake find packages via Homebrew prefix
+cmake.define = {CMAKE_PREFIX_PATH = {env = "CMAKE_PREFIX_PATH"}, OpenMP_ROOT = {env = "OpenMP_ROOT"}}

packages/leann-backend-hnsw/pyproject.toml

@@ -22,6 +22,8 @@ cmake.build-type = "Release"
 build.verbose = true
 build.tool-args = ["-j8"]
 
-# CMake definitions to optimize compilation
+# CMake definitions to optimize compilation and find Homebrew packages
 [tool.scikit-build.cmake.define]
 CMAKE_BUILD_PARALLEL_LEVEL = "8"
+CMAKE_PREFIX_PATH = {env = "CMAKE_PREFIX_PATH"}
+OpenMP_ROOT = {env = "OpenMP_ROOT"}