/**
 * src/extension/index.ts — pi-subagents Pi extension entrypoint (thin adapter).
 *
 * This is the ONLY layer that knows the local pi-types.ts (invariant I9). It
 * registers the 5 delegation tools + the /agents, /runs, /subagents commands
 * immediately, and attaches the minimal HUD widget on session_start (TUI only).
 * All business logic lives in the Pi-free core/engine.
 *
 * Zero @earendil-works/* imports.
 */
import type { ExtensionAPI } from "./pi-types.js";
export default function subagentsExtension(pi: ExtensionAPI): void;