feat(companion): add typed agent stream subscription helpers

src/companion/runtimeClient.ts

@@ -45,6 +45,12 @@ export type CompanionEventHandler = (event: string, data: unknown) => void;
 export type CompanionTypedEventHandler<TData = unknown> = (data: TData) => void;
 export type CompanionEventPredicate<TData = unknown> = (data: TData) => boolean;
 
+export const COMPANION_EVENT_NAMES = {
+  agentStream: 'agent.stream',
+  agentTyping: 'agent.typing',
+  contextWarning: 'context_warning',
+} as const;
+
 export interface RegisterNodeInput {
   nodeId: string;
   role: string;
@@ -385,6 +391,18 @@ export class CompanionRuntimeClient {
     });
   }
 
+  subscribeAgentStream<TData = unknown>(
+    handler: CompanionTypedEventHandler<TData>,
+  ): () => void {
+    return this.subscribeEvent<TData>(COMPANION_EVENT_NAMES.agentStream, handler);
+  }
+
+  subscribeAgentTyping<TData = unknown>(
+    handler: CompanionTypedEventHandler<TData>,
+  ): () => void {
+    return this.subscribeEvent<TData>(COMPANION_EVENT_NAMES.agentTyping, handler);
+  }
+
   waitForEvent<TData = unknown>(
     eventName: string,
     options?: {