fix: ensure uv build uses correct Python version in CI

- Add --python python flag to uv build commands
- This ensures wheels are built with the correct Python version (cp313 for Python 3.13, etc)
- Fixes issue where Python 3.13 CI was building cp311 wheels
- Also adds Python version verification before build

.github/workflows/ci.yml

@@ -55,12 +55,17 @@ jobs:
           echo "🔨 Building on ${{ matrix.os }} with Python ${{ matrix.python-version }}..."
           export UV_SYSTEM_PYTHON=1
           
+          # Verify Python version
+          python --version
+          which python
+          
           # Build each package
           for pkg in leann-core leann-backend-hnsw leann-backend-diskann leann; do
             echo "Building $pkg..."
             cd packages/$pkg
             rm -rf dist/ build/ _skbuild/
-            uv build --wheel
+            # Use explicit python interpreter
+            uv build --wheel --python python
             if [ ! -f dist/*.whl ]; then
               echo "❌ Failed to build $pkg!"
               exit 1