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/cloudflare-ai-gateway.ts

@@ -0,0 +1,27 @@
+import { anthropicMessagesApi } from "../api/anthropic-messages.lazy.ts";
+import { openAICompletionsApi } from "../api/openai-completions.lazy.ts";
+import { openAIResponsesApi } from "../api/openai-responses.lazy.ts";
+import { createProvider, type Provider } from "../models.ts";
+import { CLOUDFLARE_AI_GATEWAY_MODELS } from "./cloudflare-ai-gateway.models.ts";
+import { cloudflareAIGatewayAuth } from "./cloudflare-auth.ts";
+import { cloudflareStreams } from "./cloudflare-stream.ts";
+
+type CloudflareAIGatewayApi = "anthropic-messages" | "openai-completions" | "openai-responses";
+
+export function cloudflareAIGatewayProvider(): Provider<CloudflareAIGatewayApi> {
+	// The api map is pinned to all three APIs: models.dev's gateway catalog drops and
+	// restores `workers-ai/*` (openai-completions) entries over time, and inference from
+	// `models` alone would otherwise reject the openai-completions entry whenever the
+	// generated catalog happens to contain none.
+	return createProvider<CloudflareAIGatewayApi>({
+		id: "cloudflare-ai-gateway",
+		name: "Cloudflare AI Gateway",
+		auth: { apiKey: cloudflareAIGatewayAuth() },
+		models: Object.values(CLOUDFLARE_AI_GATEWAY_MODELS),
+		api: {
+			"anthropic-messages": cloudflareStreams(anthropicMessagesApi()),
+			"openai-completions": cloudflareStreams(openAICompletionsApi()),
+			"openai-responses": cloudflareStreams(openAIResponsesApi()),
+		},
+	});
+}