fix(deps): update openai agents sdk to ^0.15.0

.github/workflows/verify-pr.yaml

@@ -36,6 +36,22 @@ jobs:
       - name: Check format
         run: npm run format
 
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Setup Node.js
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version-file: '.nvmrc'
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Build
+        run: npm run build
+
   test:
     name: Test (${{ matrix.os }}, Node ${{ matrix.node-version }})
     runs-on: ${{ matrix.os }}

lifecycle/getModel.ts

@@ -1,7 +1,8 @@
 import { anthropic } from '@ai-sdk/anthropic';
 import { google } from '@ai-sdk/google';
 import { openai } from '@ai-sdk/openai';
-import { aisdk, AiSdkModel } from '@openai/agents-extensions/ai-sdk';
+import type { Model } from '@openai/agents';
+import { aisdk } from '@openai/agents-extensions/ai-sdk';
 import { createOllama, ollama } from 'ollama-ai-provider-v2';
 import { defaultOpenAIModel } from '../agent/defaults';
 import type { ModelProvider } from '../ink/models/config';
@@ -36,24 +37,32 @@ export function getProvider(modelName: string): ModelProvider {
 	return 'OpenAI';
 }
 
-export function getModel(modelName: string): AiSdkModel {
+export function getModel(modelName: string): Model {
+	// `aisdk()` returns an `AiSdkModel`, which implements `Model` but declares
+	// `getResponse`'s `rawUsage` as `Record<string, unknown> | undefined`. Under
+	// this repo's `exactOptionalPropertyTypes`, that is not assignable to core's
+	// `Model`, so bridge the upstream type-declaration mismatch with one cast.
+	return aisdk(getLanguageModel(modelName)) as Model;
+}
+
+function getLanguageModel(modelName: string) {
 	if (modelName.startsWith('claude-')) {
-		return aisdk(anthropic(modelName));
+		return anthropic(modelName);
 	}
 
 	if (modelName.startsWith('gemini-')) {
-		return aisdk(google(modelName));
+		return google(modelName);
 	}
 
 	if (modelName.startsWith('ollama-') || modelName.includes(':')) {
 		const ollamaBaseUrl = process.env.OLLAMA_BASE_URL ? normalizeOllamaBaseUrl(process.env.OLLAMA_BASE_URL) : undefined;
 		const ollamaProvider = ollamaBaseUrl
 			? createOllama({ baseURL: ollamaBaseUrl, compatibility: 'strict' })
 			: ollama;
-		return aisdk(ollamaProvider(getModelName(modelName)));
+		return ollamaProvider(getModelName(modelName));
 	}
 
-	return aisdk(openai(modelName));
+	return openai(modelName);
 }
 
 export function getModelName(modelName: string): string {