feat(coding): add core host api composition

electron/coding-runtime/pi/interaction.ts

@@ -1,4 +1,7 @@
-import type { ConversationInteraction } from '../contracts';
+import type {
+  ConversationInteraction,
+  ConversationInteractionResponse,
+} from '../contracts';
 import type { PiRpcCommand, PiRpcEvent } from './rpc-client';
 import type { PiGenerationResourceInput, PiWorkerPoolState } from './worker-pool';
 
@@ -17,12 +20,6 @@ interface StoredInteraction {
   untrack(): void;
 }
 
-export type PiInteractionResponse =
-  | { interactionId: string; cancelled: true }
-  | { interactionId: string; optionId: string }
-  | { interactionId: string; confirmed: boolean }
-  | { interactionId: string; value: string };
-
 function dialogEvent(event: PiRpcEvent): event is PiRpcEvent & {
   id: string;
   method: 'select' | 'confirm' | 'input' | 'editor';
@@ -101,7 +98,7 @@ export class PiInteractionStore {
     return structuredClone(interaction);
   }
 
-  async respond(conversationId: string, response: PiInteractionResponse): Promise<ConversationInteraction> {
+  async respond(conversationId: string, response: ConversationInteractionResponse): Promise<ConversationInteraction> {
     const stored = this.pending.get(this.key(conversationId, response.interactionId));
     if (!stored) throw new Error('Pi interaction is not pending');
     if (stored.phase === 'responding') throw new Error('Pi interaction response is already in progress');