feat(companion): add hasPendingWork runtime observability

src/companion/runtimeClient.test.ts

@@ -306,12 +306,14 @@ describe('CompanionRuntimeClient', () => {
       url: 'ws://127.0.0.1:1',
     });
     expect(client.pendingEventWaitCount).toBe(0);
+    expect(client.hasPendingWork).toBe(false);
 
     const awaited = client.waitForEvent<{ seq: number }>('agent.stream', {
       timeoutMs: 2000,
       predicate: (data) => data.seq === 2,
     });
     expect(client.pendingEventWaitCount).toBe(1);
+    expect(client.hasPendingWork).toBe(true);
 
     (client as unknown as { handleMessage: (raw: string) => void }).handleMessage(
       JSON.stringify({
@@ -330,6 +332,7 @@ describe('CompanionRuntimeClient', () => {
 
     await expect(awaited).resolves.toEqual({ seq: 2 });
     expect(client.pendingEventWaitCount).toBe(0);
+    expect(client.hasPendingWork).toBe(false);
   });
 
   it('waitForEvent rejects on timeout', async () => {
@@ -628,13 +631,16 @@ describe('CompanionRuntimeClient', () => {
     });
     await client.connect();
     expect(client.pendingRequestCount).toBe(0);
+    expect(client.hasPendingWork).toBe(false);
 
     const pending = client.call('system.capabilities');
     expect(client.pendingRequestCount).toBe(1);
+    expect(client.hasPendingWork).toBe(true);
 
     client.disconnect();
     await expect(pending).rejects.toThrow('Disconnected');
     expect(client.pendingRequestCount).toBe(0);
+    expect(client.hasPendingWork).toBe(false);
   });
 
   it('connects and performs node registration + capability discovery', async () => {