/**
 * pi-context-optimizer — Context-optimizer plan→review→execute→walkthrough loop for pi.
 *
 * Builds directly on pi's bundled `examples/extensions/plan-mode` reference
 * (same gate primitives: registerFlag/registerCommand/registerShortcut,
 * setActiveTools, tool_call blocking, before_agent_start context injection,
 * agent_end extraction, turn_end [DONE:n] tracking, appendEntry + session_start
 * resume). What it adds over plan-mode:
 *
 *   - File-backed artifacts (plan.md / tasks.md / walkthrough.md / status.json)
 *   - A REVIEW_PENDING hard gate with file-watch + slash-command approval
 *   - Opening artifacts in VS Code via the pithings/pi-vscode bridge (or `code`)
 *   - A `/grill` interactive-interview plan-drafting mode
 *   - (phase 2) a Knowledge Item store
 *
 * The gate can run in two transports:
 *   - pi-vscode terminal/Chat Participant: approval flips a file marker + a
 *     slash command; NEVER relies on a TUI modal (the Chat path auto-cancels
 *     ctx.ui.select — see pithings/pi-vscode src/chat.ts:120-125).
 *   - Bare terminal: same, plus an optional ctx.ui.select prompt at agent_end.
 *
 * See /Users/admin/.pi/plans/review-2026-07-09/plan.md for the design doc.
 */
import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
export default function contextOptimizerExtension(pi: ExtensionAPI): void;
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