Add timestamp to messages

packages/ai/test/tool-call-without-result.test.ts

@@ -33,6 +33,7 @@ describe("Tool Call Without Result Tests", () => {
 			context.messages.push({
 				role: "user",
 				content: "Please calculate 25 * 18 using the calculate tool.",
+				timestamp: Date.now(),
 			});
 
 			// Step 3: Get the assistant's response (should contain a tool call)
@@ -54,6 +55,7 @@ describe("Tool Call Without Result Tests", () => {
 			context.messages.push({
 				role: "user",
 				content: "Never mind, just tell me what is 2+2?",
+				timestamp: Date.now(),
 			});
 
 			// Step 5: The fix should filter out the orphaned tool call, and the request should succeed