test(coding-agent): stabilize CI expectations

packages/coding-agent/test/agent-session-concurrent.test.ts

@@ -354,7 +354,7 @@ describe("AgentSession concurrent prompt guard", () => {
 		expect(session.isStreaming).toBe(false);
 
 		// Second prompt should work
-		await expect(session.prompt("Second message")).resolves.toBeUndefined();
+		await expect(session.prompt("Second message")).resolves.toBe(true);
 	});
 	it("queues extension follow-up user messages on an idle session without starting a turn", async () => {
 		const model = getBundledModel("anthropic", "claude-sonnet-4-5")!;

packages/coding-agent/test/streaming-preview-height.test.ts

@@ -370,7 +370,7 @@ describe("streaming tool call preview height (bounded across renderers)", () =>
 			}
 			expect(text, `${testCase.name} preview should advertise truncation`).toMatch(testCase.marker);
 		}
-	});
+	}, 30_000);
 
 	test("task pending preview preserves full multiline context", () => {
 		const longLines = Array.from({ length: 80 }, (_, i) => `line-${i}`);