test(hooks): remove unsafe test assertions

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/question-label-truncator/hook.ts

@@ -41,6 +41,10 @@ function truncateQuestionLabels(args: AskUserQuestionArgs): AskUserQuestionArgs
   };
 }
 
+function hasQuestions(args: Record<string, unknown>): args is Record<string, unknown> & AskUserQuestionArgs {
+  return Array.isArray(args.questions);
+}
+
 export function createQuestionLabelTruncatorHook() {
   return {
     "tool.execute.before": async (
@@ -50,10 +54,8 @@ export function createQuestionLabelTruncatorHook() {
       const toolName = input.tool?.toLowerCase();
 
       if (toolName === "askuserquestion" || toolName === "ask_user_question") {
-        const args = output.args as unknown as AskUserQuestionArgs | undefined;
-
-        if (args?.questions) {
-          const truncatedArgs = truncateQuestionLabels(args);
+        if (hasQuestions(output.args)) {
+          const truncatedArgs = truncateQuestionLabels(output.args);
           Object.assign(output.args, truncatedArgs);
         }
       }