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/compat/extension-oauth-types.ts

@@ -0,0 +1,45 @@
+import type { OAuthCredentials } from "../auth/types.ts";
+
+/** Legacy extension OAuth prompt. */
+export interface OAuthPrompt {
+	message: string;
+	placeholder?: string;
+	allowEmpty?: boolean;
+}
+
+/** Legacy extension OAuth authorization link. */
+export interface OAuthAuthInfo {
+	url: string;
+	instructions?: string;
+}
+
+/** Legacy extension OAuth device-code notification. */
+export interface OAuthDeviceCodeInfo {
+	userCode: string;
+	verificationUri: string;
+	intervalSeconds?: number;
+	expiresInSeconds?: number;
+}
+
+export interface OAuthSelectOption {
+	id: string;
+	label: string;
+}
+
+export interface OAuthSelectPrompt {
+	message: string;
+	options: OAuthSelectOption[];
+}
+
+/** Callback surface retained only for coding-agent extension compatibility. */
+export interface OAuthLoginCallbacks {
+	onAuth(info: OAuthAuthInfo): void;
+	onDeviceCode(info: OAuthDeviceCodeInfo): void;
+	onPrompt(prompt: OAuthPrompt): Promise<string>;
+	onProgress?(message: string): void;
+	onManualCodeInput?(): Promise<string>;
+	onSelect(prompt: OAuthSelectPrompt): Promise<string | undefined>;
+	signal?: AbortSignal;
+}
+
+export type { OAuthCredentials };