fix(cmd): handle errors and improve output formatting

* update error handling in various commands to use blank identifier
* enhance output formatting for better readability
* add golangci-lint to Makefile for linting checks

pkg/lsp/server_test.go

@@ -51,7 +51,7 @@ func readResp(t *testing.T, buf *bytes.Buffer) map[string]interface{} {
 		}
 		lenStr := string(data[idx+16 : idx+eol])
 		var n int
-		fmt.Sscanf(lenStr, "%d", &n)
+		_, _ = fmt.Sscanf(lenStr, "%d", &n)
 		sep := bytes.Index(data, []byte("\r\n\r\n"))
 		if sep < 0 || len(data) < sep+4+n {
 			time.Sleep(5 * time.Millisecond)
@@ -60,7 +60,7 @@ func readResp(t *testing.T, buf *bytes.Buffer) map[string]interface{} {
 		body := data[sep+4 : sep+4+n]
 		buf.Next(sep + 4 + n)
 		var result map[string]interface{}
-		json.Unmarshal(body, &result)
+		_ = json.Unmarshal(body, &result)
 		return result
 	}
 	t.Fatal("timeout waiting for response")