/**
 * `aidlc explain [topic]` — read why a subsystem exists, from the installed package.
 *
 * **Why this command exists.** The explanation pages used to sit at this repo's
 * root, which npm never publishes, so a project that installed AIDLC could not
 * read them at all. They now ship inside `@rasensio/aidlc-content`, and this
 * command is the read path: it prints a page from wherever the package was
 * installed. Nothing is copied into the project — a copy in fifty projects is
 * fifty versions of the truth, the reason `glossary.ts` gives for the same choice
 * (docs-unreachable-from-installed-projects DD-1).
 *
 * Not `aidlc docs <topic>`: `docs` already writes `.aidlc/ONBOARDING.md`, and one
 * name doing two unrelated things depending on an argument is a trap (DD-2).
 *
 * Reads the content package and nothing else — no project root, no state — so it
 * works in a directory that has never seen `aidlc init` (AC-10).
 *
 * Requirements: docs-unreachable-from-installed-projects/AC-5 … AC-10
 */
import type { Command } from 'commander';
export declare function registerExplain(program: Command): void;
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