chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/ai/src/providers/openai.ts

@@ -0,0 +1,15 @@
+import { openAIResponsesApi } from "../api/openai-responses.lazy.ts";
+import { envApiKeyAuth } from "../auth/helpers.ts";
+import { createProvider, type Provider } from "../models.ts";
+import { OPENAI_MODELS } from "./openai.models.ts";
+
+export function openaiProvider(): Provider<"openai-responses"> {
+	return createProvider({
+		id: "openai",
+		name: "OpenAI",
+		baseUrl: "https://api.openai.com/v1",
+		auth: { apiKey: envApiKeyAuth("OpenAI API key", ["OPENAI_API_KEY"]) },
+		models: Object.values(OPENAI_MODELS),
+		api: openAIResponsesApi(),
+	});
+}