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/images-api-registry.ts

@@ -0,0 +1,53 @@
+import type { AssistantImages, ImagesApi, ImagesContext, ImagesFunction, ImagesModel, ImagesOptions } from "./types.ts";
+
+export type ImagesApiFunction = (
+	model: ImagesModel<ImagesApi>,
+	context: ImagesContext,
+	options?: ImagesOptions,
+) => Promise<AssistantImages>;
+
+export interface ImagesApiProvider<TApi extends ImagesApi = ImagesApi, TOptions extends ImagesOptions = ImagesOptions> {
+	api: TApi;
+	generateImages: ImagesFunction<TApi, TOptions>;
+}
+
+interface ImagesApiProviderInternal {
+	api: ImagesApi;
+	generateImages: ImagesApiFunction;
+}
+
+type RegisteredImagesApiProvider = {
+	provider: ImagesApiProviderInternal;
+	sourceId?: string;
+};
+
+const imagesApiProviderRegistry = new Map<string, RegisteredImagesApiProvider>();
+
+function wrapGenerateImages<TApi extends ImagesApi, TOptions extends ImagesOptions>(
+	api: TApi,
+	generateImages: ImagesFunction<TApi, TOptions>,
+): ImagesApiFunction {
+	return (model, context, options) => {
+		if (model.api !== api) {
+			throw new Error(`Mismatched api: ${model.api} expected ${api}`);
+		}
+		return generateImages(model as ImagesModel<TApi>, context, options as TOptions);
+	};
+}
+
+export function registerImagesApiProvider<TApi extends ImagesApi, TOptions extends ImagesOptions>(
+	provider: ImagesApiProvider<TApi, TOptions>,
+	sourceId?: string,
+): void {
+	imagesApiProviderRegistry.set(provider.api, {
+		provider: {
+			api: provider.api,
+			generateImages: wrapGenerateImages(provider.api, provider.generateImages),
+		},
+		sourceId,
+	});
+}
+
+export function getImagesApiProvider(api: ImagesApi): ImagesApiProviderInternal | undefined {
+	return imagesApiProviderRegistry.get(api)?.provider;
+}