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/index.ts

@@ -0,0 +1,48 @@
+export type { Static, TSchema } from "typebox";
+export { Type } from "typebox";
+
+// Core only, side-effect free: no generated catalogs, no provider factories,
+// no api-registry, no OAuth implementations, no compat. Provider factories
+// live under "@earendil-works/pi-ai/providers/*", API implementations under
+// "@earendil-works/pi-ai/api/*", the old global API under
+// "@earendil-works/pi-ai/compat".
+export type { AnthropicEffort, AnthropicOptions, AnthropicThinkingDisplay } from "./api/anthropic-messages.ts";
+export type { AzureOpenAIResponsesOptions } from "./api/azure-openai-responses.ts";
+export type { BedrockOptions, BedrockThinkingDisplay } from "./api/bedrock-converse-stream.ts";
+export type { GoogleOptions } from "./api/google-generative-ai.ts";
+export type { GoogleApiThinkingLevel, ResolvedGoogleThinkingLevel } from "./api/google-shared.ts";
+export type { GoogleVertexOptions } from "./api/google-vertex.ts";
+export * from "./api/lazy.ts";
+export type { MistralOptions } from "./api/mistral-conversations.ts";
+export type { OpenAICodexResponsesOptions, OpenAICodexWebSocketDebugStats } from "./api/openai-codex-responses.ts";
+export type { OpenAICompletionsOptions } from "./api/openai-completions.ts";
+export type { OpenAIResponsesOptions } from "./api/openai-responses.ts";
+export type { PiMessagesEvent, PiMessagesOptions, PiMessagesRewriteImpact } from "./api/pi-messages.ts";
+export * from "./auth/context.ts";
+export * from "./auth/credential-store.ts";
+export * from "./auth/helpers.ts";
+export * from "./auth/types.ts";
+export type {
+	OAuthAuthInfo,
+	OAuthDeviceCodeInfo,
+	OAuthLoginCallbacks,
+	OAuthPrompt,
+	OAuthSelectOption,
+	OAuthSelectPrompt,
+} from "./compat/extension-oauth-types.ts";
+export * from "./images-models.ts";
+export * from "./models.ts";
+export * from "./models-store.ts";
+export * from "./providers/faux.ts";
+export * from "./session-resources.ts";
+export * from "./types.ts";
+export * from "./utils/assistant-message-frame.ts";
+export * from "./utils/diagnostics.ts";
+export * from "./utils/event-stream.ts";
+export * from "./utils/json-parse.ts";
+export * from "./utils/overflow.ts";
+export * from "./utils/retry.ts";
+export { contentText } from "./utils/text.ts";
+export * from "./utils/typebox-helpers.ts";
+export { uuidv7 } from "./utils/uuid.ts";
+export * from "./utils/validation.ts";