/**
 * Task Tool — Delegate complex work to specialist agents.
 *
 * Spawns pi CLI in a tmux split pane (foreground) or background.
 * Completion is detected from the subagent's final assistant message
 * in the persistent session JSONL (stopReason gating). The final message
 * is the authoritative result; no RESULT.md is used.
 *
 * Three agent sources:
 *   - .pi/agents/*.md        project-local agents
 *   - ~/.pi/agent/agents/*.md user-global agents (fallback)
 *
 * P0: Persistent task registry (appendEntry + JSON), --session resume,
 *     sendMessage completion notification, Ctrl+O expand/collapse.
 * P1: Foreground mode (background:false), pane death detection, timeout.
 */
import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
export default function (pi: ExtensionAPI): void;