fix(cli): update assertion scaffold to use Message arrays instead of removed outputText

The outputText field was removed from CodeGraderInput. Update the
agentv create assertion template to extract text from output Message
arrays using a getMessageText() helper.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: christso

apps/cli/src/commands/create/commands.ts

@@ -6,9 +6,23 @@ const ASSERTION_TEMPLATES: Record<string, string> = {
   default: `#!/usr/bin/env bun
 import { defineAssertion } from '@agentv/eval';
 
-export default defineAssertion(({ outputText }) => {
+/** Extract text from the last message with the given role. */
+function getMessageText(messages: Array<{ role: string; content?: unknown }>, role = 'assistant'): string {
+  for (let i = messages.length - 1; i >= 0; i--) {
+    const msg = messages[i];
+    if (msg.role !== role) continue;
+    if (typeof msg.content === 'string') return msg.content;
+    if (Array.isArray(msg.content)) {
+      return msg.content.filter((b: any) => b.type === 'text').map((b: any) => b.text).join('\\n');
+    }
+  }
+  return '';
+}
+
+export default defineAssertion(({ output }) => {
   // TODO: Implement your assertion logic
-  const pass = outputText.length > 0;
+  const text = getMessageText(output ?? []);
+  const pass = text.length > 0;
   return {
     pass,
     reasoning: pass ? 'Output has content' : 'Output is empty',
@@ -18,9 +32,23 @@ export default defineAssertion(({ outputText }) => {
   score: `#!/usr/bin/env bun
 import { defineAssertion } from '@agentv/eval';
 
-export default defineAssertion(({ outputText }) => {
+/** Extract text from the last message with the given role. */
+function getMessageText(messages: Array<{ role: string; content?: unknown }>, role = 'assistant'): string {
+  for (let i = messages.length - 1; i >= 0; i--) {
+    const msg = messages[i];
+    if (msg.role !== role) continue;
+    if (typeof msg.content === 'string') return msg.content;
+    if (Array.isArray(msg.content)) {
+      return msg.content.filter((b: any) => b.type === 'text').map((b: any) => b.text).join('\\n');
+    }
+  }
+  return '';
+}
+
+export default defineAssertion(({ output }) => {
   // TODO: Implement your scoring logic (0.0 to 1.0)
-  const score = outputText.length > 0 ? 1.0 : 0.0;
+  const text = getMessageText(output ?? []);
+  const score = text.length > 0 ? 1.0 : 0.0;
   return {
     pass: score >= 0.5,
     score,