fix(companion): validate waitForIdle timeout option

src/companion/runtimeClient.test.ts

@@ -661,6 +661,16 @@ describe('CompanionRuntimeClient', () => {
     );
   });
 
+  it('waitForIdle validates timeoutMs option', () => {
+    const client = new CompanionRuntimeClient({
+      url: 'ws://127.0.0.1:1',
+    });
+
+    expect(() => client.waitForIdle({ timeoutMs: 0 })).toThrow(
+      'timeoutMs must be a positive number',
+    );
+  });
+
   it('waitForIdle resolves after pending event waiters are cleared', async () => {
     const client = new CompanionRuntimeClient({
       url: 'ws://127.0.0.1:1',

src/companion/runtimeClient.ts

@@ -614,6 +614,10 @@ export class CompanionRuntimeClient {
   }
 
   waitForIdle(options?: WaitForIdleOptions): Promise<void> {
+    const timeoutMs = options?.timeoutMs ?? this.requestTimeoutMs;
+    if (!Number.isFinite(timeoutMs) || timeoutMs <= 0) {
+      throw new Error('timeoutMs must be a positive number');
+    }
     const pollIntervalMs = options?.pollIntervalMs ?? 25;
     if (!Number.isFinite(pollIntervalMs) || pollIntervalMs <= 0) {
       throw new Error('pollIntervalMs must be a positive number');
@@ -621,7 +625,6 @@ export class CompanionRuntimeClient {
     if (!this.hasPendingWork) {
       return Promise.resolve();
     }
-    const timeoutMs = options?.timeoutMs ?? this.requestTimeoutMs;
     const signal = options?.signal;
 
     return new Promise<void>((resolve, reject) => {