fix: resolve golangci-lint errcheck warnings

- Add error checks for unchecked return values (errcheck)
- Remove unused struct fields (unused)
- Fix gofmt formatting issues

e2e_test.go

@@ -19,8 +19,8 @@ func TestSubmitArgoE2E_FullPayload(t *testing.T) {
 	var receivedBody map[string]any
 
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		json.NewDecoder(r.Body).Decode(&receivedBody)
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewDecoder(r.Body).Decode(&receivedBody)
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"metadata": map[string]any{"name": "doc-ingest-xyz"},
 		})
 	}))
@@ -72,8 +72,8 @@ func TestSubmitKubeflowE2E_FullPayload(t *testing.T) {
 	var receivedBody map[string]any
 
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		json.NewDecoder(r.Body).Decode(&receivedBody)
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewDecoder(r.Body).Decode(&receivedBody)
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"run": map[string]any{"id": "kf-run-e2e-789"},
 		})
 	}))
@@ -150,7 +150,7 @@ func TestSubmitArgoE2E_ConcurrentRequests(t *testing.T) {
 
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		count.Add(1)
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"metadata": map[string]any{"name": "concurrent-wf"},
 		})
 	}))
@@ -184,7 +184,7 @@ func TestSubmitArgoE2E_ConcurrentRequests(t *testing.T) {
 
 func BenchmarkSubmitArgo(b *testing.B) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte(`{"metadata":{"name":"bench-wf"}}`))
+		_, _ = w.Write([]byte(`{"metadata":{"name":"bench-wf"}}`))
 	}))
 	defer ts.Close()
 
@@ -193,13 +193,13 @@ func BenchmarkSubmitArgo(b *testing.B) {
 
 	b.ResetTimer()
 	for b.Loop() {
-		submitArgo(ctx, ts.Client(), ts.URL, "ai-ml", "document-ingestion", params, "bench-req")
+		_, _ = submitArgo(ctx, ts.Client(), ts.URL, "ai-ml", "document-ingestion", params, "bench-req")
 	}
 }
 
 func BenchmarkSubmitKubeflow(b *testing.B) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte(`{"run":{"id":"bench-run"}}`))
+		_, _ = w.Write([]byte(`{"run":{"id":"bench-run"}}`))
 	}))
 	defer ts.Close()
 
@@ -208,6 +208,6 @@ func BenchmarkSubmitKubeflow(b *testing.B) {
 
 	b.ResetTimer()
 	for b.Loop() {
-		submitKubeflow(ctx, ts.Client(), ts.URL, "rag-pipeline", params, "bench-req")
+		_, _ = submitKubeflow(ctx, ts.Client(), ts.URL, "rag-pipeline", params, "bench-req")
 	}
 }

main.go

@@ -151,7 +151,7 @@ func submitArgo(ctx context.Context, client *http.Client, host, namespace, templ
 	if err != nil {
 		return "", fmt.Errorf("argo request: %w", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	respBody, _ := io.ReadAll(resp.Body)
 
 	if resp.StatusCode >= 400 {
@@ -196,7 +196,7 @@ func submitKubeflow(ctx context.Context, client *http.Client, host, pipelineID s
 	if err != nil {
 		return "", fmt.Errorf("kubeflow request: %w", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	respBody, _ := io.ReadAll(resp.Body)
 
 	if resp.StatusCode >= 400 {

main_test.go

@@ -111,7 +111,7 @@ func TestSubmitArgo(t *testing.T) {
 		}
 
 		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"metadata": map[string]any{"name": "document-ingestion-abc123"},
 		})
 	}))
@@ -132,7 +132,7 @@ func TestSubmitArgo(t *testing.T) {
 func TestSubmitArgoError(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusBadRequest)
-		w.Write([]byte(`{"message":"bad request"}`))
+		_, _ = w.Write([]byte(`{"message":"bad request"}`))
 	}))
 	defer ts.Close()
 
@@ -153,7 +153,7 @@ func TestSubmitKubeflow(t *testing.T) {
 		}
 
 		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"run": map[string]any{"id": "kf-run-456"},
 		})
 	}))
@@ -174,7 +174,7 @@ func TestSubmitKubeflow(t *testing.T) {
 func TestSubmitKubeflowError(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusInternalServerError)
-		w.Write([]byte("internal error"))
+		_, _ = w.Write([]byte("internal error"))
 	}))
 	defer ts.Close()