test(integration): update discoverRoundtrip for the A11 discharge

The integration discoverRoundtrip test asserted the OLD A11-rider behavior
(advertisement excludes listChanged). The rider was discharged in this PR;
update the assertion to expect {tools: {listChanged: true}} (a designed
existing-test modification — the rider's own acceptance criterion, same
mandate as the discover.test.ts unit-test inversion).

Author: felixweinberger

test/integration/test/client/discoverRoundtrip.test.ts

@@ -80,8 +80,9 @@ describe('server/discover round-trip against a modern server', () => {
         expect(client.getNegotiatedProtocolVersion()).toBe(MODERN);
         expect(client.getServerVersion()).toEqual({ name: 'dual-era-server', version: '2.0.0' });
         expect(client.getInstructions()).toBe('dual era');
-        // The advertisement excludes listChanged-class capabilities, visible end to end.
-        expect(client.getServerCapabilities()).toEqual({ tools: {} });
+        // The advertisement carries listChanged-class capabilities now that
+        // the serving entries serve subscriptions/listen, visible end to end.
+        expect(client.getServerCapabilities()).toEqual({ tools: { listChanged: true } });
 
         expect(bodies.some(b => b.includes('"initialize"'))).toBe(false);
         expect(bodies[0]).toContain('server/discover');