Add macOS testing to CI/CD pipeline

macOS process enumeration is now fully implemented and tested.
All 33 tests pass on macOS including platform-specific tests.
Added test-macos job to verify macOS functionality in CI.

.github/workflows/ci.yml

@@ -118,6 +118,35 @@ jobs:
       run: cargo test --verbose
       continue-on-error: true
 
+  test-macos:
+    name: Test on macOS
+    runs-on: macos-latest
+    needs: [format, clippy]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+
+    - name: Cache cargo
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-test-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-test-
+          ${{ runner.os }}-cargo-
+
+    - name: Build
+      run: cargo build --verbose
+
+    - name: Run tests
+      run: cargo test --verbose
+
   security:
     name: Security Audit
     runs-on: ubuntu-latest