fix(companion): validate event wait timeout options

src/companion/runtimeClient.test.ts

@@ -359,6 +359,9 @@ describe('CompanionRuntimeClient', () => {
     expect(() => client.waitForEvent(123 as unknown as string)).toThrow(
       'eventName must be a non-empty string',
     );
+    expect(() => client.waitForEvent('agent.stream', { timeoutMs: 0 })).toThrow(
+      'timeoutMs must be a positive number',
+    );
   });
 
   it('waitForEvent supports AbortSignal cancellation', async () => {
@@ -600,6 +603,9 @@ describe('CompanionRuntimeClient', () => {
     expect(() => client.waitForAnyEvent(['agent.stream', 123 as unknown as string])).toThrow(
       'eventNames must not contain empty values',
     );
+    expect(() => client.waitForAnyEvent(['agent.stream'], { timeoutMs: 0 })).toThrow(
+      'timeoutMs must be a positive number',
+    );
   });
 
   it('tracks pendingRequestCount for in-flight RPCs', async () => {

src/companion/runtimeClient.ts

@@ -477,6 +477,9 @@ export class CompanionRuntimeClient {
       throw new Error('eventName must be a non-empty string');
     }
     const timeoutMs = options?.timeoutMs ?? this.requestTimeoutMs;
+    if (!Number.isFinite(timeoutMs) || timeoutMs <= 0) {
+      throw new Error('timeoutMs must be a positive number');
+    }
     const predicate = options?.predicate;
     const signal = options?.signal;
 
@@ -550,6 +553,9 @@ export class CompanionRuntimeClient {
     }
     const eventNameSet = new Set(eventNames);
     const timeoutMs = options?.timeoutMs ?? this.requestTimeoutMs;
+    if (!Number.isFinite(timeoutMs) || timeoutMs <= 0) {
+      throw new Error('timeoutMs must be a positive number');
+    }
     const predicate = options?.predicate;
     const signal = options?.signal;