fix(lint): resolve all errcheck violations in ingestion module

ingestion/internal/llm/client.go

@@ -81,7 +81,7 @@ func (c *Client) Complete(ctx context.Context, system, user string) (string, err
 	}
 
 	if resp.StatusCode == http.StatusTooManyRequests {
-		resp.Body.Close()
+		_ = resp.Body.Close()
 		wait := 5 * time.Second
 		if ra := resp.Header.Get("Retry-After"); ra != "" {
 			if secs, err := strconv.Atoi(ra); err == nil {
@@ -98,7 +98,7 @@ func (c *Client) Complete(ctx context.Context, system, user string) (string, err
 			return "", fmt.Errorf("retry LLM call: %w", err)
 		}
 	}
-	defer resp.Body.Close()
+	defer resp.Body.Close() //nolint:errcheck
 
 	out, err := io.ReadAll(resp.Body)
 	if err != nil {

ingestion/internal/llm/client_test.go

@@ -18,7 +18,7 @@ func mockServer(t *testing.T, response string) *httptest.Server {
 		assert.Equal(t, "/chat/completions", r.URL.Path)
 		assert.Equal(t, "application/json", r.Header.Get("Content-Type"))
 		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"choices": []map[string]any{
 				{"message": map[string]any{"role": "assistant", "content": response}},
 			},
@@ -51,7 +51,7 @@ func TestClient_SendsAuthHeader(t *testing.T) {
 	var gotAuth string
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		gotAuth = r.Header.Get("Authorization")
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"choices": []map[string]any{{"message": map[string]any{"content": "ok"}}},
 		})
 	}))
@@ -72,7 +72,7 @@ func TestClient_Retries429(t *testing.T) {
 			w.WriteHeader(http.StatusTooManyRequests)
 			return
 		}
-		json.NewEncoder(w).Encode(map[string]any{
+		_ = json.NewEncoder(w).Encode(map[string]any{
 			"choices": []map[string]any{{"message": map[string]any{"content": "retried"}}},
 		})
 	}))