ci: add gofmt and golangci-lint checks to test workflow

Add code quality checks that run before tests:
- gofmt formatting verification
- golangci-lint static analysis

.github/workflows/test.yml

@@ -14,6 +14,19 @@ jobs:
       with:
         go-version: 1.25
 
+    - name: Check formatting
+      run: |
+        if [ -n "$(gofmt -l .)" ]; then
+          echo "The following files are not formatted correctly:"
+          gofmt -l .
+          exit 1
+        fi
+
+    - name: Run golangci-lint
+      uses: golangci/golangci-lint-action@v6
+      with:
+        version: latest
+
     - name: Run tests
       run: go test -v ./...