chore(vendor): import pi 1.3.0

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: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/ai/test/openai-completions-provider-stream-event.test.ts

@@ -0,0 +1,94 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { completeSimple } from "../src/compat.ts";
+import type { Model } from "../src/types.ts";
+
+const mockState = vi.hoisted(() => ({
+	chunks: [] as unknown[],
+}));
+
+vi.mock("openai", () => {
+	class FakeOpenAI {
+		chat = {
+			completions: {
+				create: () => {
+					const stream = {
+						async *[Symbol.asyncIterator]() {
+							for (const chunk of mockState.chunks) yield chunk;
+						},
+					};
+					const promise = Promise.resolve(stream) as Promise<typeof stream> & {
+						withResponse: () => Promise<{
+							data: typeof stream;
+							response: { status: number; headers: Headers };
+						}>;
+					};
+					promise.withResponse = async () => ({
+						data: stream,
+						response: { status: 200, headers: new Headers({ "x-request-id": "req-1" }) },
+					});
+					return promise;
+				},
+			},
+		};
+	}
+	return { default: FakeOpenAI };
+});
+
+function openRouterModel(): Model<"openai-completions"> {
+	return {
+		id: "openrouter/auto",
+		name: "OpenRouter Auto",
+		api: "openai-completions",
+		provider: "openrouter",
+		baseUrl: "https://openrouter.ai/api/v1",
+		reasoning: false,
+		input: ["text"],
+		cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+		contextWindow: 200_000,
+		maxTokens: 8192,
+	};
+}
+
+describe("openai-completions provider stream events", () => {
+	beforeEach(() => {
+		mockState.chunks = [];
+	});
+
+	// Regression test for #9784.
+	it("exposes provider chunks including OpenRouter metadata", async () => {
+		const firstChunk = {
+			id: "chatcmpl-1",
+			model: "anthropic/claude-sonnet-4.6",
+			choices: [{ index: 0, delta: { content: "hello" } }],
+		};
+		const finalChunk = {
+			id: "chatcmpl-1",
+			model: "anthropic/claude-sonnet-4.6",
+			choices: [{ index: 0, delta: {}, finish_reason: "stop" }],
+			usage: {
+				prompt_tokens: 10,
+				completion_tokens: 2,
+				total_tokens: 12,
+				cost: 0.0012,
+				is_byok: false,
+			},
+			openrouter_metadata: { strategy: "direct", region: "iad" },
+		};
+		mockState.chunks = [firstChunk, finalChunk];
+		const events: unknown[] = [];
+
+		const message = await completeSimple(
+			openRouterModel(),
+			{ messages: [{ role: "user", content: "hi", timestamp: Date.now() }] },
+			{
+				apiKey: "test",
+				onProviderStreamEvent: (data) => {
+					events.push(data);
+				},
+			},
+		);
+
+		expect(message.content).toEqual([{ type: "text", text: "hello" }]);
+		expect(events).toEqual([firstChunk, finalChunk]);
+	});
+});