feat(companion): expose pending event wait observability

src/companion/platformClients.test.ts

@@ -39,6 +39,7 @@ function createRuntimeMock(): {
   waitForAnyEvent: ReturnType<typeof vi.fn>;
   eventSubscriptionCount: number;
   pendingRequestCount: number;
+  pendingEventWaitCount: number;
   connected: boolean;
 } {
   const connect = vi.fn(async () => undefined);
@@ -79,6 +80,7 @@ function createRuntimeMock(): {
   const waitForAnyEvent = vi.fn(async () => ({ event: 'agent.stream', data: { token: 'any' } }));
   const eventSubscriptionCount = 3;
   const pendingRequestCount = 2;
+  const pendingEventWaitCount = 1;
   const connected = true;
 
   const runtime = {
@@ -117,6 +119,9 @@ function createRuntimeMock(): {
     get pendingRequestCount() {
       return pendingRequestCount;
     },
+    get pendingEventWaitCount() {
+      return pendingEventWaitCount;
+    },
     get connected() {
       return connected;
     },
@@ -155,6 +160,7 @@ function createRuntimeMock(): {
     waitForAnyEvent,
     eventSubscriptionCount,
     pendingRequestCount,
+    pendingEventWaitCount,
     connected,
   };
 }
@@ -307,6 +313,13 @@ describe('platform companion clients', () => {
     expect(client.pendingRequestCount).toBe(mock.pendingRequestCount);
   });
 
+  it('platform pendingEventWaitCount forwards runtime getter value', async () => {
+    const mock = createRuntimeMock();
+    const client = new IOSCompanionClient({ runtime: mock.runtime, nodeId: 'ios-node' });
+
+    expect(client.pendingEventWaitCount).toBe(mock.pendingEventWaitCount);
+  });
+
   it('macOS client forwards canvas methods to runtime client', async () => {
     const mock = createRuntimeMock();
     const client = new MacOSCompanionClient({ runtime: mock.runtime, nodeId: 'mac-node' });

src/companion/platformClients.ts

@@ -279,6 +279,10 @@ export class MacOSCompanionClient {
     return this.runtime.pendingRequestCount;
   }
 
+  get pendingEventWaitCount(): number {
+    return this.runtime.pendingEventWaitCount;
+  }
+
   waitForAnyEvent<TData = unknown>(
     eventNames: readonly (CompanionEventName | string)[],
     options?: {
@@ -525,6 +529,10 @@ export class IOSCompanionClient {
     return this.runtime.pendingRequestCount;
   }
 
+  get pendingEventWaitCount(): number {
+    return this.runtime.pendingEventWaitCount;
+  }
+
   waitForAnyEvent<TData = unknown>(
     eventNames: readonly (CompanionEventName | string)[],
     options?: {
@@ -769,6 +777,10 @@ export class AndroidCompanionClient {
     return this.runtime.pendingRequestCount;
   }
 
+  get pendingEventWaitCount(): number {
+    return this.runtime.pendingEventWaitCount;
+  }
+
   waitForAnyEvent<TData = unknown>(
     eventNames: readonly (CompanionEventName | string)[],
     options?: {

src/companion/runtimeClient.test.ts

@@ -305,11 +305,13 @@ describe('CompanionRuntimeClient', () => {
     const client = new CompanionRuntimeClient({
       url: 'ws://127.0.0.1:1',
     });
+    expect(client.pendingEventWaitCount).toBe(0);
 
     const awaited = client.waitForEvent<{ seq: number }>('agent.stream', {
       timeoutMs: 2000,
       predicate: (data) => data.seq === 2,
     });
+    expect(client.pendingEventWaitCount).toBe(1);
 
     (client as unknown as { handleMessage: (raw: string) => void }).handleMessage(
       JSON.stringify({
@@ -327,6 +329,7 @@ describe('CompanionRuntimeClient', () => {
     );
 
     await expect(awaited).resolves.toEqual({ seq: 2 });
+    expect(client.pendingEventWaitCount).toBe(0);
   });
 
   it('waitForEvent rejects on timeout', async () => {

src/companion/runtimeClient.ts

@@ -306,6 +306,10 @@ export class CompanionRuntimeClient {
     return this.pending.size;
   }
 
+  get pendingEventWaitCount(): number {
+    return this.pendingEventWaits.size;
+  }
+
   async connect(): Promise<void> {
     if (this.connected) {
       return;