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-prompt-cache.test.ts

@@ -1,6 +1,6 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { stream as streamOpenAICompletions } from "../src/api/openai-completions.ts";
-import { getModel } from "../src/compat.ts";
+import { getModel, normalizeContext } from "../src/compat.ts";
 import type { Model } from "../src/types.ts";
 
 interface FakeOpenAIClientOptions {
@@ -99,10 +99,10 @@ describe("openai-completions prompt caching", () => {
 	) {
 		await streamOpenAICompletions(
 			model,
-			{
+			normalizeContext({
 				systemPrompt: "sys",
 				messages: [{ role: "user", content: "hi", timestamp: Date.now() }],
-			},
+			}),
 			{ apiKey: "test-key", ...options },
 		).result();
 
@@ -171,7 +171,7 @@ describe("openai-completions prompt caching", () => {
 		expect(headers["x-session-affinity"]).toBe("session-affinity");
 	});
 
-	it.each(["accounts/fireworks/models/glm-5p2", "accounts/fireworks/routers/glm-5p2-fast"] as const)(
+	it.each(["accounts/fireworks/models/glm-5p3", "accounts/fireworks/routers/glm-5p3-fast"] as const)(
 		"sends Fireworks session affinity for %s",
 		async (modelId) => {
 			const model = getModel("fireworks", modelId);
@@ -181,6 +181,14 @@ describe("openai-completions prompt caching", () => {
 		},
 	);
 
+	it("sends Baseten session affinity for built-in catalog models", async () => {
+		const model = getModel("baseten", "zai-org/GLM-5.2");
+		const { headers } = await captureRequest({ sessionId: "baseten-catalog-session" }, model);
+
+		expect(headers["x-session-affinity"]).toBe("baseten-catalog-session");
+		expect(headers["x-client-request-id"]).toBe("baseten-catalog-session");
+	});
+
 	it("uses OpenAI no-session format when configured", async () => {
 		const model = createModel({
 			compat: { sendSessionAffinityHeaders: true, sessionAffinityFormat: "openai-nosession" },
@@ -210,12 +218,8 @@ describe("openai-completions prompt caching", () => {
 		expect(headers["x-session-affinity"]).toBeUndefined();
 	});
 
-	it("auto-detects OpenRouter session-affinity header for OpenRouter endpoints", async () => {
-		const model = createModel({
-			provider: "openrouter",
-			baseUrl: "https://openrouter.ai/api/v1",
-			compat: { sendSessionAffinityHeaders: true },
-		});
+	it("sends OpenRouter session-affinity header by default for built-in OpenRouter models", async () => {
+		const model = getModel("openrouter", "auto");
 		const { payload, headers } = await captureRequest({ sessionId: "session-openrouter" }, model);
 
 		expect(payload?.session_id).toBeUndefined();
@@ -230,6 +234,7 @@ describe("openai-completions prompt caching", () => {
 		const model = createModel({
 			provider: "openrouter",
 			baseUrl: "https://openrouter.ai/api/v1",
+			compat: { sendSessionAffinityHeaders: false },
 		});
 		const { payload, headers } = await captureRequest({ sessionId: "session-openrouter" }, model);