feat(companion): add known event name typing and listing

src/companion/runtimeClient.test.ts

@@ -224,6 +224,18 @@ describe('CompanionRuntimeClient', () => {
     expect(typingHandler).toHaveBeenCalledWith({ active: true });
   });
 
+  it('lists known companion event names', () => {
+    const client = new CompanionRuntimeClient({
+      url: 'ws://127.0.0.1:1',
+    });
+
+    expect(client.listKnownEventNames()).toEqual([
+      'agent.stream',
+      'agent.typing',
+      'context_warning',
+    ]);
+  });
+
   it('supports subscribeContextWarning helper', () => {
     const client = new CompanionRuntimeClient({
       url: 'ws://127.0.0.1:1',