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/src/providers/openai-codex.ts

@@ -7,7 +7,7 @@ import { OPENAI_CODEX_MODELS } from "./openai-codex.models.ts";
 export function openaiCodexProvider(): Provider<"openai-codex-responses"> {
 	return createProvider({
 		id: "openai-codex",
-		name: "OpenAI Codex",
+		name: "OpenAI Codex (legacy)",
 		baseUrl: "https://chatgpt.com/backend-api",
 		auth: {
 			oauth: lazyOAuth({