CCLS Support added (#975)

Also added a test suite for both clangd and ccls

.github/workflows/pytest.yml

@@ -110,6 +110,22 @@ jobs:
         uses: DeLaGuardo/setup-clojure@13.4
         with:
           cli: latest
+      - name: Install ccls (C/C++ Language Server)
+        shell: bash
+        run: |
+          if [[ "${{ runner.os }}" == "Linux" ]]; then
+            sudo apt-get update
+            sudo apt-get install -y ccls
+          elif [[ "${{ runner.os }}" == "macOS" ]]; then
+            brew install ccls
+          fi
+          # Windows: ccls requires building from source with MSYS2/LLVM, skipped in CI
+          # Verify installation
+          if command -v ccls &> /dev/null; then
+            echo "ccls installed: $(ccls --version 2>&1 | head -1)"
+          else
+            echo "ccls not available on this platform (expected on Windows)"
+          fi
       - name: Setup Java (for JVM based languages)
         uses: actions/setup-java@v4
         with: