feat(companion): validate event wait helper input names

src/companion/runtimeClient.test.ts

@@ -343,6 +343,15 @@ describe('CompanionRuntimeClient', () => {
     vi.useRealTimers();
   });
 
+  it('waitForEvent validates eventName input', () => {
+    const client = new CompanionRuntimeClient({
+      url: 'ws://127.0.0.1:1',
+    });
+
+    expect(() => client.waitForEvent('')).toThrow('eventName must be a non-empty string');
+    expect(() => client.waitForEvent('   ')).toThrow('eventName must be a non-empty string');
+  });
+
   it('waitForEvent supports AbortSignal cancellation', async () => {
     const client = new CompanionRuntimeClient({
       url: 'ws://127.0.0.1:1',
@@ -573,6 +582,9 @@ describe('CompanionRuntimeClient', () => {
     expect(() => client.waitForAnyEvent([])).toThrow(
       'eventNames must contain at least one event name',
     );
+    expect(() => client.waitForAnyEvent(['agent.stream', '  '])).toThrow(
+      'eventNames must not contain empty values',
+    );
   });
 
   it('connects and performs node registration + capability discovery', async () => {